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Originally Posted by Rickertsen2
this is kind of cheating but:
f(x)=0 where x=0
I assume you are asking this for a reason. Do you have a proof that no such function exists or something?
Interesting question.
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The function you proposed (a constant) is not invertible, unfortunately.
I'm still giving this some thought, but I don't think there's such a function.
It is, indeed an interesting question. Does look like an assignment, though
More later...
[EDIT: David Guzman beat me to it...]