vertical line test

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# vertical line test

Submitted by lvoyster on Sat, 05/14/2011 - 05:11

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Does anyone know when/where the vertical line test was first used? I've been learning all sorts of interesting things about the history of functions and relations but I can't find anything about the vertical line test.

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## Re: vertical line test

Hi Steven, you may find some answers here - http://mathworld.wolfram.com/Surjection.html