## How to label the 13th floor

Posted by Maiu
on August 23, 2013

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Further evidence that explaining the joke ruins it.

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Except that the absolute value is unnecessary, the square root of 169 is 13, it can’t be -13, otherwise square root wouldn’t be a function.

So the joke is more of a fail.

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Read the topic, they’re giving a bit more details about what I just said: http://www.reddit.com/r/AskReddit/comments/1khosy/what_do_you_think_is_the_strangest_or_most/

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Using the square root symbol denotes the principal square root, which is always positive. Thus the absolute value is not needed. For example, this is why there is a ± in the quadratic formula.

And yes f(x) = sqrt(x) is a function.

http://en.wikipedia.org/wiki/Square_root

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12′

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http://en.wikipedia.org/wiki/Square_root

The second and third paragraphs explain this. The square root sign denotes the positive square root. If you are referring to the negative root, you just put a minus sign in front of it. If you are referring to both roots, you use the ± sign. 🙂

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