# History

 Nov. 12 2022 Added "Swap rows and columns" Sep. 4 2022 Added "Determinant of orthogonal matrix" Sep. 4 2022 Added "Definition of identity matrix" Sep. 3 2022 Added "Inverse of orthogonal matrix" Jul. 10 2022 Added "An example of orthogonal matrix" Aug. 13 2022 Added "Product of orthogonal matrix" Jul. 10 2022 Added "Definition of orthogonal matrix" May. 29 2022 Added "Trace defined by three properties" May. 14 2022 Added Linearity of transpose Apr. 22 2022 Added Linearity of trace Apr. 3 2022 Added Cyclic property of trace Mar. 27 2022 Added Symmetry of trace Mar. 5 2022 Added Examples of trace Mar. 5 2022 Added Trace of a transposed matrix Jan. 29 2022 Added Determinant of the trace Jan. 2 2022 Added Determinant of a transposed matrix Nov. 13 2021 Added Inverse of a transposed matrix Oct. 3 2021 Added Transpose of product of two matrices Oct. 3 2021 Added Examples of transposed matrix Sep. 5 2021 Added Transpose matrix Sep. 1 2019 Added Lagrange interpolation May 12 2019 Added Example of the geometrc distribution May 4 2019 Added Gaussian integral May 2 2019 Added Cofactor expansion May 1 2019 Added Cofactor matrix Jan. 2 2019 Added How to calculate the rank of a matrix Jan. 1 2019 Added How to diagonalize a 3x3 matrix Dec.r 30 2018 Added search engine Oct. 28 2018 Added Kronecker's delta Dec. 24 2017 Added Definition of Determinant Nov. 3 2017 Added Triangle Inequality Oct. 22 2017 Added Variance of Exponential Distribution Oct. 14 2017 Added Expectation value of Exponential Distribution Oct. 7 2017 Added "a matrix is invertible" $\Longleftrightarrow$ "its determinant is non-zero" Sep. 30 2017 Added Definition of linearly independence/dependence and examples Sep. 24 2017 Added Computing the square root of 3 Sep. 16 2017 Added inverse matrix of a 4x4 matrix using Gauss-Jordan elimination Sep. 6 2017 Added inverse matrix of a 3x3 matrix using Gauss-Jordan elimination Sep. 2 2017 Added Variance of Geometric Distribution Aug. 19 2017 Added Expectation value of Geometric Distribution Aug. 11 2017 Added Euler angle Aug. 11 2017 Added Calculator of system of linear equations Jul. 30 2017 Added Gaussian integral Jul. 8 2017 Added Rodrigues' rotation formula Jun. 25 2017 Added determinant 2x2 Jun. 12 2017 Added cofactor matrix 4x4 June 3 2017 Added cofactor matrix 3x3 May 27 2017 Added cofactor matrix 2x2 May 13 2017 Added determinant 3x3 May 20 2017 Added inverse matrix 4x4 May 6 2017 Added inverse matrix 3x3 May 4 2017 Added cofactor expansion 4x4 May 4 2017 Added cofactor expansion 3x3 May 4 2017 Added 4x4 determinant May 3 2017 Added an error page May 3 2017 Added determinant 5x5 May 3 2017 Released