3. Let W be the set of all 2 X 2 complex Hermitian matrices, that is, the set of 2 X 2 complex matrices such that A = A* (the bar denoting complex conjugation). As pointed out in Example 6 of Chapter 2, W is a vector space over the field of real numbers, under the usual operations Verify that (x, y, z, t) -> [t+x, y+iz; y-iz, t-x] is an isomorphism of R4 onto W.