(Section 1.9: Inverses of One-to-One Functions) 1.9.5 PART C: ONE-TO-ONE FUNCTIONS andTHE HORIZONTAL LINE TEST (HLT)We now discuss which functions are invertible. From Section 1.1, A relationfis a function±Each input tofin its domain yields exactly one output in its range. ±The graph of y=fx()in the xy-plane passes the Vertical Line Test (VLT). A function cannot allow an input in its domain to yield two or more different outputs. The following do notrepresent functions:
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