"apply predicate" generating function

From: Mikito Harakiri (mikharakiri_at_iahu.com)
Date: 07/08/04 

Date: Thu, 8 Jul 2004 14:33:51 -0700

Suppose we have

f(x)=7+3*x+1*x^2+4*x^3+...

and I want to select only monomials with coefficients that meet a certain
criteria, say those that are greater than 2, so that we'll have

g(x)=7+3*x+4*x^3+...

Without loss of generality we can narrow the scope to predicate >=0 only.
But then, I'm stuck. What operator maps f into g?

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