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Convert symbolic expressions like sqrt(2) or exp(1) to rational numbers

I have coefficents of a rational polynomial f(x) in terms of symbolic expressions like sqrt(2) and exp(1). How I convert these coefficients to rational number approximations of them, so that I can work in a structure like a polynomial ring?

Convert symbolic expressions like sqrt(2) or exp(1) to rational numbers

I have coefficents of a rational polynomial f(x) in terms of symbolic expressions like sqrt(2) and exp(1).

How I convert these coefficients to rational number approximations of them, so that I can work in a structure like a polynomial ring?

Convert symbolic expressions like sqrt(2) or exp(1) to rational numbers

I have coefficents of a rational polynomial f(x) in terms of symbolic expressions like sqrt(2) and exp(1).

How can I convert these coefficients to rational number approximations of them, so that I can work in a structure like a polynomial ring?