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posted by  Purple Flower on 8/19/2008 9:27:40 PM  |  status: Live  

Abstract Algebra

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Determine whether the binary operation * defined is commutative or (and) associative.

a. * defined on Z by letting a * b = a - b.

b. * defined on Q by letting a* b = ab + 1

 

c. * defined on Z+ by letting a* b = 2
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posted by Galois on 8/19/2008 10:53:49 PM  |  status: Live
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