Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
Drexel University or The Math Forum.


cdn
Posts:
19
Registered:
1/13/11


group theory proof
Posted:
Jul 20, 2011 1:19 PM


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


cdn

8/20/11


Jack


