Jump to key moments of How To Prove A Function Is Well Defined

What makes a function "well-defined?"
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What makes a function "well-defined?"
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Even and odd functions: Equations | Transformations of functions | Algebra 2 | Khan Academy
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"Prove that the function `f: N-N` , defined by `f(x)=x^2+x+1` is one-one but not
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Prove that a function f:[0,∞)→[-5,∞) defined as f(x)=4x²+4x-5 is both one and onto
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