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Is this operation associative? |
2008-09-06 |
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Francesca pose la question :
Determine whether the binary operation * defined is commutative and whether * is associative
* defined on Z by a*b = a-b\
I understand how to figure out if it's commutative, but I thought for a binary operation to be associative, it had to have at least three elements, so I don't know how to tell if this associative or not.
Penny Nom and Victoria West lui répond. |
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