- #1

**[SOLVED] Binary Operations**

I believe I understand the critera to see of something is a "group"

1.It must be binary

2.It must be associative

3.Must contain a Identity

4.Must have a inverse

My question is the how to read a problem.

For example:

All real numbers minus zero under the operation a*b = abs(ab), does this make a group. Not looking for a answer, as this is homework, but I am looking for a little help. Thanks