Is {(–2, 4), (5, 8), (3, 6), (5, 9)} a function?

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Answer 1 · 2015-05-27T12:04:50

#{(-2,4), (5,8), (3,6), (5,9)}# is not a function
since
#f(5)# maps into 2 different values: #8 and 9#