College Algebra / Unit 5 Alg 241 short lesson, about 20 seconds
One-to-One Functions
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The idea
A one-to-one function is a function in which each output value corresponds to exactly one input value; outputs, like inputs, never split.
In practice
f(x) = x² fails the standard: f(2) and f(−2) both output 4, so the output 4 belongs to two inputs.
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