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The domain of the function that assign to each pair of integers the maximum of these two integers is ___________

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The domain of the function that assign to each pair of integers the maximum of these two integers is ___________

(a) N

(b) Z

(c) Z ^+

(d) Z^+ X Z^+

I have been asked this question in class test.

This is a very interesting question from Functions in portion Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics

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Right answer is (d) Z^+ X Z^+

Best explanation: The domain of the integers is Z^+  X Z^+.

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