To Explain: The one-to-one function.
A function f is called one-to-one if every element of the range corresponds to exactly one element of the domain.
That is, whenever or whenever .
To Explain: The graph of the function is one-to-one.
Use horizontal line test to determine the graph is one-to-one.
A graph is one-to-one if and only if the graph of f intersects the horizontal line at most once.
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