Lightweight fast matrix class in C# based on http:https://blog.ivank.net/.
I also did some changes based on the comments on the original page.

All this is written in C#. Parse() and ToString() methods included. Matrix class can throw exceptions (MException).

• exponentiation by integer
• LU decomposition
• determinant
• inversion
• solve system of linear equations
• transpose, ...

• array-like access (a[2,4])
• addition (a + b)
• subtraction (a - b)
• unary minus (-a)
• multiplication (a * b)
• constant multiplication (5.4 * a)

It contains matrix multiplication with Strassen algorithm, which is memory efficient and cahce-oblivious, it works with still the same array in each level of recursion.

This algorithm is automatically selected if matrices are of form 2^N x 2^N, N>5.