A summation that "feeds back into itself"

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Thread starter tovisonnenberg
Start date Sep 13, 2020
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tovisonnenberg

Thread starter
Sep 13, 2020

Hi everyone! I need to use sigma notation to build a summation that "feeds back into itself". By that I mean that it should model a sum whose terms are f(x) + f(f(x)) + f(f(f(x))) and so on. How would I do this?

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mfb

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Sep 13, 2020

You can write f(f(f(x))) as f³(x) and that 3 can be replaced by a variable, too.

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A summation that "feeds back into itself"

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