Hi everyone.(adsbygoogle = window.adsbygoogle || []).push({});

I have two questions that I hope you can help me with.

First when trying to show isomorphism between groups is it enough to show that the order of each element within the group is the same in the other group? For example the groups (Z/14Z)* and (Z/9Z)*. They are both of order 6 and both have

1 element of order 1

1 element of order 2

2 elements of order 3

2 elements of order 6

And does the binary operator have to be the same in both groups when doing group isomorphism?

And the second question(actually the third one). I am trying to write the multiplication table for the following ring

Z_2[X]/(x^2 + x +). I know that this ring has 4 elements. Is it correct that the elements are the following

1

x + 1

x^2 + 1

x^2 + x + 1

?

Hope you can help me with this,

X-il3

**Physics Forums - The Fusion of Science and Community**

# Group isomorphism and Polynomial ring modulo ideal

Have something to add?

- Similar discussions for: Group isomorphism and Polynomial ring modulo ideal

Loading...

**Physics Forums - The Fusion of Science and Community**