Linear Algebra
Given two matrices of the same size whose columns all sum to 1, the (cross) product of those will also have columns that total to 1.
A * A-1 = A-1 * A = I
but
A * B ≠ B * A
Given two matrices of the same size whose columns all sum to 1, the (cross) product of those will also have columns that total to 1.
A * A-1 = A-1 * A = I
but
A * B ≠ B * A