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OpenStudy (anonymous):
Is this a function? {(0, 0), (1, -1), (1, 1), (2, -2), (2, 2)}
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OpenStudy (anonymous):
No, as in a function, every element in the domain must have a unique image in the co-domain, whereas the elements 1 and 2 in the domain don't have a unique image, viz. 1 is related to -1 and 1.....
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