Tests for subgroups and subrings
Posted: 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!
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!