Re: binary operations, commutative / associative

Quote:

Originally Posted by

**simond75** a o b = a + b + ab, a * b = a + b + 1

For each binary operations on Z, answer the following with explanations:

A) are the commutative?

B) are they associative?

C) Do thy have an identity element?

D) Are there inverses?

E) Is Z a group with respect to either of these operations?

*Z is of course the symbol for set of integers (with double lines in middle connector)

The way you posted these, you seem to be saying "**I expect you to do these for me**".

Not even a please.

Well, it does not work that way. You show some effort. You show your own work.