Prove that the set $B = \left\{ \begin{bmatrix}a&b\\c&d\end{bmatrix} | a,b,c,d ∈ \mathbb{Z}\right\}$ is not a subspace of $M(2,2)$.
2026-03-26 06:05:18.1774505118
Is M2x2 a subpace of itself?
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