Determining if a rational function has a subtraction-free expression – mathoverflow.net

Determining if a rational function has a subtraction-free expression – mathoverflow.net

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This question was first asked by Mehtaab Sawhney in Alex Postnikov's combinatorics class. Given a rational function $F=P(x_1,...,x_n)/Q(x_1,...,x_n)$ with (say) integer coefficients, it is often of ...

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