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Question: Function of function

Question:Function of function

DarkMath 125 Maple
syntax 2dmath functional-operator
February 09 2021
1

Hello, 

How one would define a function of a function-- a functional?

Given

f(g(r)) := int(g(r), r)

I would like to get 

int(h(r+eps),r)

when I call it like

f(h(r+eps))

I could achieve this behaviour by substitions, but is there a nicer and shorter way of doing this?

Thanks in advance.
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