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Math Help - binary operations, commutative / associative

  1. #1
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    DELETED Sorry
    Last edited by simond75; October 21st 2012 at 04:15 PM.
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    Re: binary operations, commutative / associative

    Quote Originally Posted by simond75 View Post
    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.
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