how to write the dimensions of a matrix
Matrix (mathematics) The size of a matrix is defined by the number of rows and columns that it contains. A matrix with m rows and n columns is called an m × n matrix or m-by-n matrix, while m and n are called its dimensions. For example, the matrix A above is a 3 × 2 matrix.
Hermitian matrix The diagonal elements must be real, as they must be their own complex conjugate.
Exponentiation Any nonzero number raised to the 0 power is 1:[11]
Bracket Forms include round (also called "parentheses"), square, curly (also called "braces"), and angle brackets (also called "chevrons"); and various other pairs of symbols.