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I've looked around on the internet a bunch, for a standard way to write an arbitrary number of nested functions (eg. ##{f_1}\circ{f_2}\circ\cdots\circ{f_n}##) without ellipses and with a second input variable (eg. the

I more or less want to be able to generalize things like arbitrary sums, products and continued fractions (as well as arbitrary functions).

*i*in ##f_i##), but never found anything. If anyone does this, what is the standard way to write that kind of thing? To use messy ellipses?I more or less want to be able to generalize things like arbitrary sums, products and continued fractions (as well as arbitrary functions).

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