One-to-One Function
A function for which every element of the range of the function corresponds to exactly one element
of the domain. One-to-one is often written 1-1.
Note: y =
f(x)
is a function if it passes the vertical
line test. It is a 1-1
function
if it passes both the vertical line test and the horizontal
line test. Another way of testing whether a function is 1-1 is given
below.
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