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Suppose I have $n$ functions namely $f_1,...,f_n$. If I want to sum them then I could use Sigma $\Sigma$, if I want to multiply them, I could use capital Pi $\Pi$. But what if I want to compose all of them? Is there a known notation convention for something like this: $$\circ{}_{i=1}^n f_i$$

AspiringMat
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    Sincw composition isn't conmutative, I'd just use $f_1\circ \ldots\circ f_n $ to avoid potential confusion. – Mark S. May 11 '17 at 10:42
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    I don't think there is an established notation for this. In particular, you'd have to disambiguate whether you mean $f_1\circ \ldots\circ f_n$ or $f_n\circ \ldots\circ f_1$ – Hagen von Eitzen May 11 '17 at 10:42

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