Factorable function

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This has a recursive definition, relative to a collection of elementary operations (e.g., sum, product) on other factorable functions, starting with some set of primitive functions. For example, starting with the power functions, LaTeX: ax^n, for any LaTeX: a and LaTeX: n, and allowing only the sum operation, we can obtain all polynomials. The polynomial LaTeX: x + 2x^2 + 9x^3 factors into 3 parts.

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