Web Reference: A one to one function is a function that maps no two elements of its domain to a single value in its range. A one-to-one function can be determined by using the horizontal line test. Also, there are various other ways to determine a one-one function. To easily remember what one to one functions are, try to recall this statement: “for every y, there is a unique x.” The next two sections will show you why this phrase helps us remember the core concept behind one to one functions. Understand one to one functions (injective), how to test them, and view solved examples and graphs. Learn quick ways to identify one to one functions for exams.
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