Subgroup of direct product

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Homework Statement


Let G1, G2 be groups with subgroups H1,H2. Show that

[{x1,x2) | x1 element of H1, x2 element of H2} is a subgroup of the direct product of G1 X G2

The Attempt at a Solution


I'm not sure how to begin solving this problem.
 

Answers and Replies

  • #2
Dick
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Show it the usual way you show a set is a subgroup. Show H1xH2 is closed under the group operation, that it has an identity, that it has inverses, etc.
 

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