Question

There are at least three different unitary matrices of order 2. True or false with full explanation

Answer 1

TRUE

There are at least three different unitary matrices of order 2. If A and B are two unitary matrices then:

1) The product of the two unitary matrices A and B is a unitary matrix.

2) The inverse of a unitary matrix is also a unitary matrix,

3) Identity matrices are unitary.