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## Homework Statement

H = {(x,y,z) [tex]\in[/tex] R^3 | x + y^2 + z = 0} [tex]\subseteq[/tex] R^3

T = {A [tex]\in[/tex] M

_{2,2}| A

^{T}= A} [tex]\subseteq[/tex] M

_{2,2}

## The Attempt at a Solution

Our lecturer wasn't quite clear about how to go about this.

He talked out closed under addition and multiplication but thats about it.

Help would be greatly appreciated