semath info

History  

 
Recent updates
Aug. 19 2023   Added "Add definition of cofactor matrix"
Jun. 4 2023   Added "Add case if the 1st column is 1000..."
May 1 2023   Added "Add one row to another"

 

Past updates:
Apr. 30 2023   Added "Case if a column is sum"
Apr. 9 2023   Added 2x2 matrix diagonalization
Feb. 5 2023   Added "Case if a row is sum "
Jan. 28 2023   Added "Case if a scalar is multiplied "
Jan. 28 2023   Added "Case if a column is scalar-multiplied "
Jan. 2 2023   Added "Case if a row is scalar-multiplied "
Dec. 13 2022   Added "Case two rows are equal"
Dec. 3 2022   Added "Case two columns are equal"
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