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## Homework Statement

If [tex]f[/tex] is some function defined at points "s" and "t," is there any way to simplify the following expression?

[tex]f((f(t)-f(s))[/tex]

## Homework Equations

None that I know of.

## The Attempt at a Solution

I've been tinkering with this for a while and so far, I've determined the answer to be no. I know that

[tex]f(t)-f(s)\neq f(t-s)[/tex]

in general, and that implies that

[tex]f(f(t)-f(s))\neq f(f(t))-f(f(s))[/tex]

But does anyone know another way to simplify this to maybe some kind of composition?