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Alexander Fedoruk2016-01-20 01:00:57
Alexander Fedoruk, 2016-01-20 01:00:57
How to prove that a relation is not a function (mathematical logic)?
Logic task, translation from Polish. I can’t understand: either the task is formed incorrectly, or I don’t understand what it is about at all.
Prove that for any a!=0,b,c in R, the relation f(x)=a*x^2 + b * x + c is not a function.
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