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Let A=NtimesN, N-set of natural numbers ...

Let `A=NtimesN`, N-set of natural numbers and '`ast`' be a binary operation on A defined by `(a,b)ast(c,d)=(ac-bd,ad+bc)`.
Show that '`ast`' is commutative on A.

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MAXIMUM PUBLICATION-RELATIONS AND FUNCTIONS-EXAMPLE
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