diff --git a/Ai/NeuralNetwork/Neuron.php b/Ai/NeuralNetwork/Neuron.php
index 7769e4f4b..bdb5aa566 100755
--- a/Ai/NeuralNetwork/Neuron.php
+++ b/Ai/NeuralNetwork/Neuron.php
@@ -22,7 +22,7 @@ namespace phpOMS\Ai\NeuralNetwork;
  * @link    https://jingga.app
  * @since   1.0.0
  */
-class Neuron
+final class Neuron
 {
     /**
      * Neuron inputs
diff --git a/Image/Kernel.php b/Image/Kernel.php
index 5a50da54d..a2eb1cf39 100755
--- a/Image/Kernel.php
+++ b/Image/Kernel.php
@@ -26,54 +26,116 @@ use phpOMS\Utils\NumericUtils;
  */
 final class Kernel
 {
+    /**
+     * Kernel matrix for ridge
+     *
+     * @var array<int, int[]>
+     * @since 1.0.0
+     */
     public const KERNEL_RIDGE_1 = [
         [0, -1, 0],
         [-1, 4, -1],
         [0, -1, 0],
     ];
 
+    /**
+     * Kernel matrix for ridge
+     *
+     * @var array<int, int[]>
+     * @since 1.0.0
+     */
     public const KERNEL_RIDGE_2 = [
         [-1, -1, -1],
         [-1, 8, -1],
         [-1, -1, -1],
     ];
 
+    /**
+     * Kernel matrix for sharpening
+     *
+     * @var array<int, int[]>
+     * @since 1.0.0
+     */
     public const KERNEL_SHARPEN = [
         [0, -1, 0],
         [-1, 5, -1],
         [0, -1, 0],
     ];
 
+    /**
+     * Kernel matrix for blurring
+     *
+     * @var array<int, int[]>
+     * @since 1.0.0
+     */
     public const KERNEL_BOX_BLUR = [
         [1 / 9, 1 / 9, 1 / 9],
         [1 / 9, 1 / 9, 1 / 9],
         [1 / 9, 1 / 9, 1 / 9],
     ];
 
+    /**
+     * Kernel matrix for gaussian blurring
+     *
+     * @var array<int, int[]>
+     * @since 1.0.0
+     */
     public const KERNEL_GAUSSUAN_BLUR_3 = [
         [1 / 16, 2 / 16, 1 / 16],
         [2 / 16, 4 / 16, 2 / 16],
         [1 / 16, 2 / 16, 1 / 16],
     ];
 
+    /**
+     * Kernel matrix for embossing
+     *
+     * @var array<int, int[]>
+     * @since 1.0.0
+     */
     public const KERNEL_EMBOSS = [
         [-2, -1, 0],
         [-1, 1, 1],
         [0, 1, 2],
     ];
 
+    /**
+     * Kernel matrix for unsharpening
+     *
+     * @var array<int, int[]>
+     * @since 1.0.0
+     */
     public const KERNEL_UNSHARP_MASKING = [
-        [-1 / 256,  -4 / 256, -6 / 256, -4 / 256, -1 / 256],
-        [-4 / 256,  -16 / 256, -24 / 256, -16 / 256, -4 / 256],
-        [-6 / 256,  -24 / 256, 476 / 256, -24 / 256, -6 / 256],
-        [-4 / 256,  -16 / 256, -24 / 256, -16 / 256, -4 / 256],
-        [-1 / 256,  -4 / 256, -6 / 256, -4 / 256, -1 / 256],
+        [-1 / 256, -4 / 256, -6 / 256, -4 / 256, -1 / 256],
+        [-4 / 256, -16 / 256, -24 / 256, -16 / 256, -4 / 256],
+        [-6 / 256, -24 / 256, 476 / 256, -24 / 256, -6 / 256],
+        [-4 / 256, -16 / 256, -24 / 256, -16 / 256, -4 / 256],
+        [-1 / 256, -4 / 256, -6 / 256, -4 / 256, -1 / 256],
     ];
 
     /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
+    /**
+     * Apply kernel matrix
+     *
+     * @param string $inParth Image file path
+     * @param string $outPath Image output path
+     * @param array  $kernel  Kernel matrix
+     *
+     * @return void
+     *
      * @see https://en.wikipedia.org/wiki/Kernel_(image_processing)
      * @see https://towardsdatascience.com/image-processing-with-python-blurring-and-sharpening-for-beginners-3bcebec0583a
      * @see https://web.eecs.umich.edu/~jjcorso/t/598F14/files/lecture_0924_filtering.pdf
+     *
+     * @since 1.0.0
      */
     public static function convolve(string $inPath, string $outPath, array $kernel) : void
     {
diff --git a/Image/Skew.php b/Image/Skew.php
index 22736f9b3..246939649 100755
--- a/Image/Skew.php
+++ b/Image/Skew.php
@@ -24,6 +24,16 @@ namespace phpOMS\Image;
  */
 final class Skew
 {
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Automatically rotate image based on projection profile
      *
diff --git a/Image/Thresholding.php b/Image/Thresholding.php
index 935f55e1a..4759c381e 100755
--- a/Image/Thresholding.php
+++ b/Image/Thresholding.php
@@ -26,6 +26,16 @@ use phpOMS\Utils\ImageUtils;
  */
 final class Thresholding
 {
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Perform integral thresholding
      *
diff --git a/Math/Functions/Algebra.php b/Math/Functions/Algebra.php
index b216f521d..1d85409fa 100644
--- a/Math/Functions/Algebra.php
+++ b/Math/Functions/Algebra.php
@@ -26,6 +26,16 @@ use phpOMS\Math\Matrix\Exception\InvalidDimensionException;
  */
 final class Algebra
 {
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Get the product of two arrays
      *
diff --git a/Math/Geometry/Shape/D2/Circle.php b/Math/Geometry/Shape/D2/Circle.php
index d3d67ec38..1b77b76a1 100755
--- a/Math/Geometry/Shape/D2/Circle.php
+++ b/Math/Geometry/Shape/D2/Circle.php
@@ -24,6 +24,16 @@ namespace phpOMS\Math\Geometry\Shape\D2;
  */
 final class Circle implements D2ShapeInterface
 {
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Area
      *
diff --git a/Math/Geometry/Shape/D2/Ellipse.php b/Math/Geometry/Shape/D2/Ellipse.php
index 8bbc8eb9f..5e13daf80 100755
--- a/Math/Geometry/Shape/D2/Ellipse.php
+++ b/Math/Geometry/Shape/D2/Ellipse.php
@@ -24,6 +24,16 @@ namespace phpOMS\Math\Geometry\Shape\D2;
  */
 final class Ellipse implements D2ShapeInterface
 {
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Area
      *
diff --git a/Math/Geometry/Shape/D2/Quadrilateral.php b/Math/Geometry/Shape/D2/Quadrilateral.php
index a7bd4f0cb..a0f8ce40c 100755
--- a/Math/Geometry/Shape/D2/Quadrilateral.php
+++ b/Math/Geometry/Shape/D2/Quadrilateral.php
@@ -24,6 +24,16 @@ namespace phpOMS\Math\Geometry\Shape\D2;
  */
 final class Quadrilateral implements D2ShapeInterface
 {
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Calculate the surface area from the length of all sides and the angle between a and b
      *
diff --git a/Math/Geometry/Shape/D2/Rectangle.php b/Math/Geometry/Shape/D2/Rectangle.php
index 91ea83eb0..b51dd3dbc 100755
--- a/Math/Geometry/Shape/D2/Rectangle.php
+++ b/Math/Geometry/Shape/D2/Rectangle.php
@@ -24,6 +24,16 @@ namespace phpOMS\Math\Geometry\Shape\D2;
  */
 final class Rectangle implements D2ShapeInterface
 {
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Area
      *
diff --git a/Math/Geometry/Shape/D2/Trapezoid.php b/Math/Geometry/Shape/D2/Trapezoid.php
index 7edb13496..1ec6d866b 100755
--- a/Math/Geometry/Shape/D2/Trapezoid.php
+++ b/Math/Geometry/Shape/D2/Trapezoid.php
@@ -24,6 +24,16 @@ namespace phpOMS\Math\Geometry\Shape\D2;
  */
 final class Trapezoid implements D2ShapeInterface
 {
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Area
      *
diff --git a/Math/Geometry/Shape/D2/Triangle.php b/Math/Geometry/Shape/D2/Triangle.php
index 84f1efdf5..112934944 100755
--- a/Math/Geometry/Shape/D2/Triangle.php
+++ b/Math/Geometry/Shape/D2/Triangle.php
@@ -24,6 +24,16 @@ namespace phpOMS\Math\Geometry\Shape\D2;
  */
 final class Triangle implements D2ShapeInterface
 {
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Area
      *
diff --git a/Math/Geometry/Shape/D3/Cone.php b/Math/Geometry/Shape/D3/Cone.php
index 5c46b079d..935bd1ac8 100755
--- a/Math/Geometry/Shape/D3/Cone.php
+++ b/Math/Geometry/Shape/D3/Cone.php
@@ -24,6 +24,16 @@ namespace phpOMS\Math\Geometry\Shape\D3;
  */
 final class Cone implements D3ShapeInterface
 {
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Volume
      *
diff --git a/Math/Geometry/Shape/D3/Cuboid.php b/Math/Geometry/Shape/D3/Cuboid.php
index 7767ef45c..2361d9195 100755
--- a/Math/Geometry/Shape/D3/Cuboid.php
+++ b/Math/Geometry/Shape/D3/Cuboid.php
@@ -24,6 +24,16 @@ namespace phpOMS\Math\Geometry\Shape\D3;
  */
 final class Cuboid implements D3ShapeInterface
 {
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Volume
      *
diff --git a/Math/Geometry/Shape/D3/Cylinder.php b/Math/Geometry/Shape/D3/Cylinder.php
index bef7d0812..4ea37ef6e 100755
--- a/Math/Geometry/Shape/D3/Cylinder.php
+++ b/Math/Geometry/Shape/D3/Cylinder.php
@@ -24,6 +24,16 @@ namespace phpOMS\Math\Geometry\Shape\D3;
  */
 final class Cylinder implements D3ShapeInterface
 {
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Volume
      *
diff --git a/Math/Geometry/Shape/D3/Prism.php b/Math/Geometry/Shape/D3/Prism.php
index 5b0319e06..c90864593 100755
--- a/Math/Geometry/Shape/D3/Prism.php
+++ b/Math/Geometry/Shape/D3/Prism.php
@@ -26,6 +26,16 @@ use phpOMS\Math\Geometry\Shape\D2\Polygon;
  */
 final class Prism implements D3ShapeInterface
 {
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Get volume of regular polygon prism by side length
      *
diff --git a/Math/Geometry/Shape/D3/RectangularPyramid.php b/Math/Geometry/Shape/D3/RectangularPyramid.php
index 0b71157cf..3016d50a9 100755
--- a/Math/Geometry/Shape/D3/RectangularPyramid.php
+++ b/Math/Geometry/Shape/D3/RectangularPyramid.php
@@ -24,6 +24,16 @@ namespace phpOMS\Math\Geometry\Shape\D3;
  */
 final class RectangularPyramid implements D3ShapeInterface
 {
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Volume
      *
diff --git a/Math/Geometry/Shape/D3/Tetrahedron.php b/Math/Geometry/Shape/D3/Tetrahedron.php
index 80632e629..a546fa268 100755
--- a/Math/Geometry/Shape/D3/Tetrahedron.php
+++ b/Math/Geometry/Shape/D3/Tetrahedron.php
@@ -24,6 +24,16 @@ namespace phpOMS\Math\Geometry\Shape\D3;
  */
 final class Tetrahedron implements D3ShapeInterface
 {
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Volume
      *
diff --git a/Math/Numerics/Integration.php b/Math/Numerics/Integration.php
index 4ddeb8345..352387d44 100755
--- a/Math/Numerics/Integration.php
+++ b/Math/Numerics/Integration.php
@@ -24,6 +24,16 @@ namespace phpOMS\Math\Numerics;
  */
 final class Integration
 {
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Integrate function by using rectangles from the left side
      *
diff --git a/Math/Numerics/Interpolation/LagrangeInterpolation.php b/Math/Numerics/Interpolation/LagrangeInterpolation.php
index 58f18e319..70b9a31cd 100755
--- a/Math/Numerics/Interpolation/LagrangeInterpolation.php
+++ b/Math/Numerics/Interpolation/LagrangeInterpolation.php
@@ -39,7 +39,8 @@ final class LagrangeInterpolation implements InterpolationInterface
      *
      * @since 1.0.0
      */
-    public function __construct(array $points) {
+    public function __construct(array $points)
+    {
         $this->points = $points;
     }
 
diff --git a/Math/Numerics/Interpolation/LinearInterpolation.php b/Math/Numerics/Interpolation/LinearInterpolation.php
index 26e5da4e8..0ec184965 100755
--- a/Math/Numerics/Interpolation/LinearInterpolation.php
+++ b/Math/Numerics/Interpolation/LinearInterpolation.php
@@ -65,7 +65,8 @@ final class LinearInterpolation implements InterpolationInterface
      *
      * @since 1.0.0
      */
-    public function __construct(array $points) {
+    public function __construct(array $points)
+    {
         $this->points = $points;
 
         $n = \count($this->points);
diff --git a/Math/Optimization/Simplex.php b/Math/Optimization/Simplex.php
index 5d49f4e4e..a9ca0040c 100644
--- a/Math/Optimization/Simplex.php
+++ b/Math/Optimization/Simplex.php
@@ -17,31 +17,113 @@ namespace phpOMS\Math\Optimization;
 /**
  * Simplex class.
  *
+ * The Simplex algorithm aims to solve a linear program - optimising a linear function subject
+ * to linear constraints. As such it is useful for a very wide range of applications.
+ *
+ * N.B. The linear program has to be given in *slack form*, which is as follows:
+ * maximise
+ *     c_1 * x_1 + c_2 * x_2 + ... + c_n * x_n + v
+ * subj. to
+ *     a_11 * x_1 + a_12 * x_2 + ... + a_1n * x_n + b_1 = s_1
+ *     a_21 * x_1 + a_22 * x_2 + ... + a_2n * x_n + b_2 = s_2
+ *     ...
+ *     a_m1 * x_1 + a_m2 * x_2 + ... + a_mn * x_n + b_m = s_m
+ * and
+ *     x_1, x_2, ..., x_n, s_1, s_2, ..., s_m >= 0
+ *
+ * Every linear program can be translated into slack form; the parameters to specify are:
+ *      - the number of variables, n, and the number of constraints, m;
+ *      - the matrix A = [[A_11, A_12, ..., A_1n], ..., [A_m1, A_m2, ..., A_mn]];
+ *      - the vector b = [b_1, b_2, ..., b_m];
+ *      - the vector c = [c_1, c_2, ..., c_n] and the constant v.
+ *
+ * Complexity: O(m^(n/2)) worst case
+ *             O(n + m) average case (common)
+ *
  * @package phpOMS\Math\Optimization
+ * @license Copyright (c) 2015 Petar Veličković
  * @license OMS License 2.0
  * @link    https://jingga.app
  * @link    https://github.com/PetarV-/Algorithms/blob/master/Mathematical%20Algorithms/Simplex%20Algorithm.cpp
  * @since   1.0.0
  */
-class Simplex
+final class Simplex
 {
+    /**
+     * Bounding equations
+     *
+     * @var int
+     * @since 1.0.0
+     */
     private int $m = 0;
 
+    /**
+     * Bounding variables
+     *
+     * @var int
+     * @since 1.0.0
+     */
     private int $n = 0;
 
+    /**
+     * Bounding equations
+     *
+     * @var array<int, array<int|float>>
+     * @since 1.0.0
+     */
     private array $A = [];
 
+    /**
+     * Bounds for bounding equations
+     *
+     * @var array<int|float>
+     * @since 1.0.0
+     */
     private array $b = [];
 
+    /**
+     * Maximize vector
+     *
+     * @var array<int|float>
+     * @since 1.0.0
+     */
     private array $c = [];
 
+    /**
+     * Maximized value
+     *
+     * @var float
+     * @since 1.0.0
+     */
     private float $v = 0.0;
 
-    private array $Basic = [];
+    /**
+     * Basic solutions
+     *
+     * @var array<int|float>
+     * @since 1.0.0
+     */
+    private array $basic = [];
 
-    private array $Nonbasic = [];
+    /**
+     * Non-basic solutions
+     *
+     * @var array<int|float>
+     * @since 1.0.0
+     */
+    private array $nonbasic = [];
 
-    private function pivot (int $x, int $y) : void
+    /**
+     * Pivot yth variable around xth constraint
+     *
+     * @param int $x Constraint index
+     * @param int $y Variable index
+     *
+     * @return void
+     *
+     * @since 1.0.0
+     */
+    private function pivot(int $x, int $y) : void
     {
         for ($j = 0; $j < $this->n; ++$j) {
             if ($j !== $y) {
@@ -74,11 +156,18 @@ class Simplex
         $this->v += $this->c[$y] * $this->b[$x];
         $this->c[$y] *= $this->A[$x][$y];
 
-        $temp               = $this->Basic[$x];
-        $this->Basic[$x]    = $this->Nonbasic[$y];
-        $this->Nonbasic[$y] = $temp;
+        $temp               = $this->basic[$x];
+        $this->basic[$x]    = $this->nonbasic[$y];
+        $this->nonbasic[$y] = $temp;
     }
 
+    /**
+     * Perform simplex iteration step
+     *
+     * @return int 0 = OK, 1 = stop, -1 = unbound
+     *
+     * @since 1.0.0
+     */
     private function iterate() : int
     {
         $ind  = -1;
@@ -86,9 +175,9 @@ class Simplex
 
         for ($j = 0; $j < $this->n; ++$j) {
             if ($this->c[$j] > 0
-                && ($best === -1 || $this->Nonbasic[$j] < $ind)
+                && ($best === -1 || $this->nonbasic[$j] < $ind)
             ) {
-                $ind  = $this->Nonbasic[$j];
+                $ind  = $this->nonbasic[$j];
                 $best = $j;
             }
         }
@@ -119,6 +208,16 @@ class Simplex
         return 0;
     }
 
+    /**
+     * Initialize simplex algorithm
+     *
+     * 1. possibly converts LP to slack form
+     * 2. find feasible basic solution
+     *
+     * @return int 0 = OK, 1 = stop, -1 = unbound
+     *
+     * @since 1.0.0
+     */
     private function initialize() : int
     {
         $k    = -1;
@@ -133,11 +232,11 @@ class Simplex
 
         if ($this->b[$k] >= 0) {
             for ($j = 0; $j < $this->n; ++$j) {
-                $this->Nonbasic[$j] = $j;
+                $this->nonbasic[$j] = $j;
             }
 
             for ($i = 0; $i < $this->m; ++$i) {
-                $this->Basic[$i] = $this->n + $i;
+                $this->basic[$i] = $this->n + $i;
             }
 
             return 0;
@@ -145,11 +244,11 @@ class Simplex
 
         ++$this->n;
         for ($j = 0; $j < $this->n; ++$j) {
-            $this->Nonbasic[$j] = $j;
+            $this->nonbasic[$j] = $j;
         }
 
         for ($i = 0; $i < $this->m; ++$i) {
-            $this->Basic[$i] = $this->n + $i;
+            $this->basic[$i] = $this->n + $i;
         }
 
         $oldC = [];
@@ -180,7 +279,7 @@ class Simplex
 
         $basicZ = -1;
         for ($i = 0; $i < $this->m; ++$i) {
-            if ($this->Basic[$i] === $this->n - 1) {
+            if ($this->basic[$i] === $this->n - 1) {
                 $basicZ = $i;
                 break;
             }
@@ -192,7 +291,7 @@ class Simplex
 
         $nonbasicZ = -1;
         for ($j = 0; $j < $this->n; ++$j) {
-            if ($this->Nonbasic[$j] === $this->n - 1) {
+            if ($this->nonbasic[$j] === $this->n - 1) {
                 $nonbasicZ = $j;
                 break;
             }
@@ -202,20 +301,20 @@ class Simplex
             $this->A[$i][$nonbasicZ] = $this->A[$i][$this->n - 1];
         }
 
-        $temp                         = $this->Nonbasic[$nonbasicZ];
-        $this->Nonbasic[$nonbasicZ]   = $this->Nonbasic[$this->n - 1];
-        $this->Nonbasic[$this->n - 1] = $temp;
+        $temp                         = $this->nonbasic[$nonbasicZ];
+        $this->nonbasic[$nonbasicZ]   = $this->nonbasic[$this->n - 1];
+        $this->nonbasic[$this->n - 1] = $temp;
 
         --$this->n;
         for ($j = 0; $j < $this->n; ++$j) {
-            if ($this->Nonbasic[$j] > $this->n) {
-                --$this->Nonbasic[$j];
+            if ($this->nonbasic[$j] > $this->n) {
+                --$this->nonbasic[$j];
             }
         }
 
         for ($i = 0; $i < $this->m; ++$i) {
-            if ($this->Basic[$i] > $this->n) {
-                --$this->Basic[$i];
+            if ($this->basic[$i] > $this->n) {
+                --$this->basic[$i];
             }
         }
 
@@ -228,7 +327,7 @@ class Simplex
         for ($j = 0; $j < $this->n; ++$j) {
             $ok = false;
             for ($k = 0; $k < $this->n; ++$k) {
-                if ($j === $this->Nonbasic[$k]) {
+                if ($j === $this->nonbasic[$k]) {
                     $this->c[$k] += $oldC[$j];
                     $ok = true;
                     break;
@@ -240,7 +339,7 @@ class Simplex
             }
 
             for ($i = 0; $i < $this->m; ++$i) {
-                if ($j === $this->Basic[$i]) {
+                if ($j === $this->basic[$i]) {
                     for ($k = 0; $k < $this->n; ++$k) {
                         $this->c[$k] = $oldC[$j] * $this->A[$i][$k];
                     }
@@ -254,13 +353,25 @@ class Simplex
         return 0;
     }
 
-    public function solve(array $A, array $b, array $c)
+    /**
+     * Solve simplex problem
+     *
+     * @param array<int, array<int|float>> $A Bounding equations
+     * @param int[]|float[]             $b Boundings for equations
+     * @param int[]|float[]             $c Equation to maximize
+     *
+     * @return array{0:array<int|float>, 1:float}
+     *
+     * @since 1.0.0
+     */
+    public function solve(array $A, array $b, array $c) : array
     {
         $this->A = $A;
         $this->b = $b;
         $this->c = $c;
 
         // @todo: createSlackForm() required?
+        // @todo: create minimize
 
         $this->m = \count($A);
         $this->n = \count(\reset($A));
@@ -278,11 +389,11 @@ class Simplex
 
         $result = [];
         for ($j = 0; $j < $this->n; ++$j) {
-            $result[$this->Nonbasic[$j]] = 0;
+            $result[$this->nonbasic[$j]] = 0;
         }
 
         for ($i = 0; $i < $this->m; ++$i) {
-            $result[$this->Basic[$i]] = $this->b[$i];
+            $result[$this->basic[$i]] = $this->b[$i];
         }
 
         return [$result, $this->v];
diff --git a/Math/Parser/Evaluator.php b/Math/Parser/Evaluator.php
index e9307952f..459980ac7 100755
--- a/Math/Parser/Evaluator.php
+++ b/Math/Parser/Evaluator.php
@@ -24,6 +24,16 @@ namespace phpOMS\Math\Parser;
  */
 final class Evaluator
 {
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Evaluate function.
      *
diff --git a/Math/Solver/Root/Bisection.php b/Math/Solver/Root/Bisection.php
index 23fd7eaa7..3b29b0a45 100644
--- a/Math/Solver/Root/Bisection.php
+++ b/Math/Solver/Root/Bisection.php
@@ -32,6 +32,16 @@ final class Bisection
      */
     public const EPSILON = 1e-6;
 
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Perform bisection to find the root of a function
      *
diff --git a/Math/Solver/Root/Illinois.php b/Math/Solver/Root/Illinois.php
index c8e87f25a..9f5ca9be9 100644
--- a/Math/Solver/Root/Illinois.php
+++ b/Math/Solver/Root/Illinois.php
@@ -32,6 +32,16 @@ final class Illinois
      */
     public const EPSILON = 1e-6;
 
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Perform bisection to find the root of a function
      *
diff --git a/Math/Solver/Root/RegulaFalsi.php b/Math/Solver/Root/RegulaFalsi.php
index 7916b40b0..bd9a794a9 100644
--- a/Math/Solver/Root/RegulaFalsi.php
+++ b/Math/Solver/Root/RegulaFalsi.php
@@ -32,6 +32,16 @@ final class RegulaFalsi
      */
     public const EPSILON = 1e-6;
 
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Perform bisection to find the root of a function
      *
diff --git a/Utils/IO/Csv/CsvDatabaseMapper.php b/Utils/IO/Csv/CsvDatabaseMapper.php
index f746d8683..5f884db05 100644
--- a/Utils/IO/Csv/CsvDatabaseMapper.php
+++ b/Utils/IO/Csv/CsvDatabaseMapper.php
@@ -26,7 +26,7 @@ use phpOMS\Utils\IO\IODatabaseMapper;
  * @link    https://jingga.app
  * @since   1.0.0
  */
-class CsvDatabaseMapper implements IODatabaseMapper
+final class CsvDatabaseMapper implements IODatabaseMapper
 {
     /**
      * Database connection
diff --git a/Utils/IO/Json/InvalidJsonException.php b/Utils/IO/Json/InvalidJsonException.php
index 8899d571d..3a6dc412e 100755
--- a/Utils/IO/Json/InvalidJsonException.php
+++ b/Utils/IO/Json/InvalidJsonException.php
@@ -22,7 +22,7 @@ namespace phpOMS\Utils\IO\Json;
  * @link    https://jingga.app
  * @since   1.0.0
  */
-class InvalidJsonException extends \UnexpectedValueException
+final class InvalidJsonException extends \UnexpectedValueException
 {
     /**
      * Constructor.
diff --git a/Utils/IO/Spreadsheet/SpreadsheetDatabaseMapper.php b/Utils/IO/Spreadsheet/SpreadsheetDatabaseMapper.php
index 3f460740e..efa5467d2 100755
--- a/Utils/IO/Spreadsheet/SpreadsheetDatabaseMapper.php
+++ b/Utils/IO/Spreadsheet/SpreadsheetDatabaseMapper.php
@@ -27,7 +27,7 @@ use phpOMS\Utils\StringUtils;
  * @link    https://jingga.app
  * @since   1.0.0
  */
-class SpreadsheetDatabaseMapper implements IODatabaseMapper
+final class SpreadsheetDatabaseMapper implements IODatabaseMapper
 {
     /**
      * Database connection
diff --git a/Utils/IO/Zip/Gz.php b/Utils/IO/Zip/Gz.php
index 24b8cfd95..11144277e 100755
--- a/Utils/IO/Zip/Gz.php
+++ b/Utils/IO/Zip/Gz.php
@@ -24,8 +24,18 @@ namespace phpOMS\Utils\IO\Zip;
  * @link    https://jingga.app
  * @since   1.0.0
  */
-class Gz implements ArchiveInterface
+final class Gz implements ArchiveInterface
 {
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * {@inheritdoc}
      */
diff --git a/Utils/IO/Zip/Tar.php b/Utils/IO/Zip/Tar.php
index 98fefacf5..283398746 100755
--- a/Utils/IO/Zip/Tar.php
+++ b/Utils/IO/Zip/Tar.php
@@ -31,8 +31,18 @@ use phpOMS\System\File\Local\Directory;
  * @link    https://jingga.app
  * @since   1.0.0
  */
-class Tar implements ArchiveInterface
+final class Tar implements ArchiveInterface
 {
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * {@inheritdoc}
      */
diff --git a/Utils/IO/Zip/TarGz.php b/Utils/IO/Zip/TarGz.php
index 27fcf58c5..b960a2838 100755
--- a/Utils/IO/Zip/TarGz.php
+++ b/Utils/IO/Zip/TarGz.php
@@ -26,8 +26,18 @@ use phpOMS\System\File\Local\File;
  * @link    https://jingga.app
  * @since   1.0.0
  */
-class TarGz implements ArchiveInterface
+final class TarGz implements ArchiveInterface
 {
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * {@inheritdoc}
      */
diff --git a/Utils/IO/Zip/Zip.php b/Utils/IO/Zip/Zip.php
index 1bb1a4132..d1b2a80ae 100755
--- a/Utils/IO/Zip/Zip.php
+++ b/Utils/IO/Zip/Zip.php
@@ -27,8 +27,18 @@ use phpOMS\System\File\Local\Directory;
  * @link    https://jingga.app
  * @since   1.0.0
  */
-class Zip implements ArchiveInterface
+final class Zip implements ArchiveInterface
 {
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * {@inheritdoc}
      */
diff --git a/Utils/Parser/Calendar/ICalParser.php b/Utils/Parser/Calendar/ICalParser.php
index d82dc2f52..86d730bce 100755
--- a/Utils/Parser/Calendar/ICalParser.php
+++ b/Utils/Parser/Calendar/ICalParser.php
@@ -22,8 +22,18 @@ namespace phpOMS\Utils\Parser\Calendar;
  * @link    https://jingga.app
  * @since   1.0.0
  */
-class ICalParser
+final class ICalParser
 {
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Parse iCal data
      *
diff --git a/Utils/Parser/Document/DocumentParser.php b/Utils/Parser/Document/DocumentParser.php
index 894add951..6fcf2d295 100755
--- a/Utils/Parser/Document/DocumentParser.php
+++ b/Utils/Parser/Document/DocumentParser.php
@@ -25,8 +25,18 @@ use PhpOffice\PhpWord\Writer\HTML;
  * @link    https://jingga.app
  * @since   1.0.0
  */
-class DocumentParser
+final class DocumentParser
 {
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Document to string
      *
diff --git a/Utils/Parser/Pdf/PdfParser.php b/Utils/Parser/Pdf/PdfParser.php
index 6750541d2..8b38d8941 100755
--- a/Utils/Parser/Pdf/PdfParser.php
+++ b/Utils/Parser/Pdf/PdfParser.php
@@ -26,7 +26,7 @@ use phpOMS\Utils\StringUtils;
  * @link    https://jingga.app
  * @since   1.0.0
  */
-class PdfParser
+final class PdfParser
 {
     /**
      * PDFToText path.
@@ -44,6 +44,16 @@ class PdfParser
      */
     public static string $pdftoppm = '/usr/bin/pdftoppm';
 
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Pdf to text
      *
diff --git a/Utils/Parser/Php/ArrayParser.php b/Utils/Parser/Php/ArrayParser.php
index 092aa81e6..eb66bef1f 100755
--- a/Utils/Parser/Php/ArrayParser.php
+++ b/Utils/Parser/Php/ArrayParser.php
@@ -26,8 +26,18 @@ use phpOMS\Contract\SerializableInterface;
  * @link    https://jingga.app
  * @since   1.0.0
  */
-class ArrayParser
+final class ArrayParser
 {
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Serializing array (recursively).
      *
diff --git a/Utils/Parser/Presentation/PresentationParser.php b/Utils/Parser/Presentation/PresentationParser.php
index 8a75ec8e1..d68e53f21 100755
--- a/Utils/Parser/Presentation/PresentationParser.php
+++ b/Utils/Parser/Presentation/PresentationParser.php
@@ -24,8 +24,18 @@ use PhpOffice\PhpPresentation\IOFactory;
  * @link    https://jingga.app
  * @since   1.0.0
  */
-class PresentationParser
+final class PresentationParser
 {
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Presentation to string
      *
diff --git a/Utils/Parser/Spreadsheet/SpreadsheetParser.php b/Utils/Parser/Spreadsheet/SpreadsheetParser.php
index 424909c90..b5e07c63d 100755
--- a/Utils/Parser/Spreadsheet/SpreadsheetParser.php
+++ b/Utils/Parser/Spreadsheet/SpreadsheetParser.php
@@ -25,8 +25,18 @@ use PhpOffice\PhpSpreadsheet\Worksheet\PageSetup;
  * @link    https://jingga.app
  * @since   1.0.0
  */
-class SpreadsheetParser
+final class SpreadsheetParser
 {
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Spreadsheet to string
      *
diff --git a/Utils/RnG/ArrayRandomize.php b/Utils/RnG/ArrayRandomize.php
index adfb5fbda..6619e3b11 100755
--- a/Utils/RnG/ArrayRandomize.php
+++ b/Utils/RnG/ArrayRandomize.php
@@ -22,8 +22,18 @@ namespace phpOMS\Utils\RnG;
  * @link    https://jingga.app
  * @since   1.0.0
  */
-class ArrayRandomize
+final class ArrayRandomize
 {
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Yates array shuffler.
      *
diff --git a/Utils/RnG/DateTime.php b/Utils/RnG/DateTime.php
index c288b10ff..704a8e39f 100755
--- a/Utils/RnG/DateTime.php
+++ b/Utils/RnG/DateTime.php
@@ -22,8 +22,18 @@ namespace phpOMS\Utils\RnG;
  * @link    https://jingga.app
  * @since   1.0.0
  */
-class DateTime
+final class DateTime
 {
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Get a random \DateTime.
      *
diff --git a/Utils/RnG/Email.php b/Utils/RnG/Email.php
index 4ae5ab4cf..50a71dcca 100755
--- a/Utils/RnG/Email.php
+++ b/Utils/RnG/Email.php
@@ -22,8 +22,18 @@ namespace phpOMS\Utils\RnG;
  * @link    https://jingga.app
  * @since   1.0.0
  */
-class Email
+final class Email
 {
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Get a random email.
      *
diff --git a/Utils/RnG/File.php b/Utils/RnG/File.php
index 22b951659..9262a991f 100755
--- a/Utils/RnG/File.php
+++ b/Utils/RnG/File.php
@@ -22,7 +22,7 @@ namespace phpOMS\Utils\RnG;
  * @link    https://jingga.app
  * @since   1.0.0
  */
-class File
+final class File
 {
     /**
      * Extensions.
@@ -44,6 +44,16 @@ class File
         ['flv'], ['fla'], ['deb'], ['py'], ['pl'],
     ];
 
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Get a random file extension.
      *
diff --git a/Utils/RnG/LinearCongruentialGenerator.php b/Utils/RnG/LinearCongruentialGenerator.php
index bfc60986e..c10e42258 100755
--- a/Utils/RnG/LinearCongruentialGenerator.php
+++ b/Utils/RnG/LinearCongruentialGenerator.php
@@ -22,7 +22,7 @@ namespace phpOMS\Utils\RnG;
  * @link    https://jingga.app
  * @since   1.0.0
  */
-class LinearCongruentialGenerator
+final class LinearCongruentialGenerator
 {
     /**
      * BSD seed value.
@@ -40,6 +40,16 @@ class LinearCongruentialGenerator
      */
     private static $msvcrtSeed = 0;
 
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * BSD random number
      *
diff --git a/Utils/RnG/Name.php b/Utils/RnG/Name.php
index f02a9faec..fddd55d8f 100755
--- a/Utils/RnG/Name.php
+++ b/Utils/RnG/Name.php
@@ -22,7 +22,7 @@ namespace phpOMS\Utils\RnG;
  * @link    https://jingga.app
  * @since   1.0.0
  */
-class Name
+final class Name
 {
     private static array $names = [
         'western' => [
@@ -481,6 +481,16 @@ class Name
         ],
     ];
 
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Get a random string.
      *
diff --git a/Utils/RnG/Phone.php b/Utils/RnG/Phone.php
index bdfe6f699..a16908b0c 100755
--- a/Utils/RnG/Phone.php
+++ b/Utils/RnG/Phone.php
@@ -22,8 +22,18 @@ namespace phpOMS\Utils\RnG;
  * @link    https://jingga.app
  * @since   1.0.0
  */
-class Phone
+final class Phone
 {
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Get a random phone number.
      *
diff --git a/Utils/RnG/StringUtils.php b/Utils/RnG/StringUtils.php
index 55e67dd6b..1cc6c73d0 100755
--- a/Utils/RnG/StringUtils.php
+++ b/Utils/RnG/StringUtils.php
@@ -22,8 +22,18 @@ namespace phpOMS\Utils\RnG;
  * @link    https://jingga.app
  * @since   1.0.0
  */
-class StringUtils
+final class StringUtils
 {
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Get a random string.
      *
diff --git a/Utils/RnG/Text.php b/Utils/RnG/Text.php
index 2b8b8a87b..face5e3b1 100755
--- a/Utils/RnG/Text.php
+++ b/Utils/RnG/Text.php
@@ -22,7 +22,7 @@ namespace phpOMS\Utils\RnG;
  * @link    https://jingga.app
  * @since   1.0.0
  */
-class Text
+final class Text
 {
     /**
      * Vocabulary.
diff --git a/Utils/RnG/UUID.php b/Utils/RnG/UUID.php
index 3dcf94611..a7661145f 100755
--- a/Utils/RnG/UUID.php
+++ b/Utils/RnG/UUID.php
@@ -24,6 +24,16 @@ namespace phpOMS\Utils\RnG;
  */
 final class UUID
 {
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
     /**
      * Get default random UUID
      *