Drexel dragonThe Math ForumDonate to the Math Forum



Search All of the Math Forum:

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.


Math Forum » Discussions » Math Topics » alt.math.undergrad.independent

Topic: group theory proof
Replies: 1   Last Post: Aug 20, 2011 6:50 AM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
cdn

Posts: 19
Registered: 1/13/11
group theory proof
Posted: Jul 20, 2011 1:19 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

Let A and B be sets. Prove: If AXB (A cross B)is a group, then A is a normal subgroup of AXB.

I don't even know how to start. I now that in order to be a NORMAL subgroup, the left and right cosets of A must be the same. How do you show that algebraically?


Date Subject Author
7/20/11
Read group theory proof
cdn
8/20/11
Read Re: group theory proof
Jack

Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2014. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.