Function |
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A Function is a relation where each value in the domain is paired with a single value in the range. |
Below is a very basic example of a function.
Figure 1. |
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The vertical line test can be performed on a series of points to test if they are a valid function. If the line never touches more than one point, you are dealing with a valid function.
Figure 2. |
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Our function is valid by the verical line test.