(2) Let G₁ and G₂ be groups. (a) Suppose H₁ ≤ G₁ and H₂ ≤ G2. Is H₁ × H₂ ≤ G₁ X G2 always true? Justify your answer with a proof or counterexample. (b) Suppose H ≤ G₁ X G₂. Is it always true that H = H₁ × H₂ for some H₁ ≤ G₁ and H₂ G₂? Justify your answer with a proof or counterexample.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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(2) Let G₁ and G₂ be groups.
(a) Suppose H₁ ≤ G₁ and H₂ ≤ G₂. Is H₁ × H₂ ≤ G₁ × G₂ always true? Justify
your answer with a proof or counterexample.
(b) Suppose H≤ G₁ X G₂. Is it always true that H = H₁ x H₂ for some H₁ ≤ G₁
and H₂ ≤ G₂? Justify your answer with a proof or counterexample.
Transcribed Image Text:(2) Let G₁ and G₂ be groups. (a) Suppose H₁ ≤ G₁ and H₂ ≤ G₂. Is H₁ × H₂ ≤ G₁ × G₂ always true? Justify your answer with a proof or counterexample. (b) Suppose H≤ G₁ X G₂. Is it always true that H = H₁ x H₂ for some H₁ ≤ G₁ and H₂ ≤ G₂? Justify your answer with a proof or counterexample.
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