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Is there a circle symbol for the composition of two functions? Or do I have to resort to using other ways to represent that?

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just as a tip, Wikipedia uses LaTeX style markup for their functions. When your press the edit button you can see :<math>(f\circ f)(x) = f(f(x)) = f^2(x)</math> ;) – Davy Landman Jan 5 '11 at 8:43
up vote 59 down vote accepted

It's \circ:

\usepackage{fixltx2e} % To make \( ... \) robust
\( f \circ f \)
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Ah thanks, but just \circ would have done :) – wrongusername Jan 5 '11 at 8:20
@wrongusername. Yes, but it's generally considered a good idea to post something compilable. This one was not exactly hard :-) – Joseph Wright Jan 5 '11 at 8:25

Probably this is a good chance to recall the Detexify website, where you can simply draw the symbol you want, and obtain the needed code.

I'm a bad illustrator, but for me, after drawing the circle, \circ was the first hit.

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Dror: I think it's better to actually name websites so that people know what they're clicking to and also so that they have a better chance of remembering it next time. – Loop Space Jan 5 '11 at 10:18
I'd like to add that I tried to find this symbol with detexify but I failed as I found many other similar looking symbols but not \circ. I actually needed to google "latex combine function symbol", to find this question. – ohcibi May 15 at 17:40

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