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Question

Determine whether or not each of the definition of given below gives a binary operation. In the event that is not a binary operation, give justification for this.
(v) On Z+, defined by ab=a

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Solution

On Z+, defined by ab=a
It is seen that for each a,bZ+, there is a unique element aZ+.
This means that carries each pair (a,b) to a unique element ab =a in Z+.
Therefore, is a binary operation.


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