assert_is_diagonal_matrix
                        Is the input a diagonal matrix?
assert_is_identity_matrix
                        Is the matrix an identity matrix?
assert_is_lower_triangular_matrix
                        Is the matrix upper/lower triangular?
assert_is_square_matrix
                        Is the matrix a square matrix?
assert_is_symmetric_matrix
                        Is the input a symmetric matrix?
assert_is_zero_matrix   Is the input a zero matrix
