Thread: binary operations, commutative / associative

DELETED Sorry

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.