Tests for subgroups and subrings

Forum for the GRE subject test in mathematics.
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mtey
Posts: 22
Joined: Tue Oct 27, 2009 12:30 pm

Tests for subgroups and subrings

Post by mtey » Wed Nov 04, 2009 5:39 am

I thought you may find these useful.

http://en.wikipedia.org/wiki/Subgroup_test

http://en.wikipedia.org/wiki/Subring_test

They are fairly easy and if you memorize these tests you will have no trouble finding whether a particular subset is subring or subgroup. Pay attention that the subring test here does not require a ring to have a unity!



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