Suppose that G1 G2 and H1 H2. Prove that G1 H1 G2 H2.
Chapter 8, Problem 16E(choose chapter or problem)
Suppose that \(G_1 \approx G_2\) and \(H_1 \approx H_2\). Prove that \(G_1 \oplus H_1 \approx G_2 \oplus\) \(\mathrm{H}_2\). State the general case.
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