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H = ([a,b;c,d] : a+d =0}
Dim(M_{2x2})= 4, so a basis would have 4 components?
I got this far and am stuck.
[a, b ; c , -a] = a[1,0; 0,-1] + b[0, 1;0,0] +c[0,0; 1,0]
Dim(M_{2x2})= 4, so a basis would have 4 components?
I got this far and am stuck.
[a, b ; c , -a] = a[1,0; 0,-1] + b[0, 1;0,0] +c[0,0; 1,0]