prove that $M_2(\mathbb{R})/K \cong \mathbb{R}$. 6. Use the Fundamental Homomorphism Theorem to prove that $\mathbb{Z}_4 \times \mathbb{Z}_4/<(1,1)> \cong \mathbb{Z}_4$ (without using problem 7).
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To do this, we can use the Fundamental Homomorphism Theorem. Let's define a homomorphism φ: M^2R -> M^2/(K∩M^2)R by φ(m^2r) = m^2(K∩M^2)R. We need to show that φ is well-defined, i.e., if m^2r = m'^2r' for some m, m' in M^2 and r, r' in R, then φ(m^2r) = Show more…
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