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How to use sign for symbolic operations?
I use Mathematica 3.0. My question is how to solve the following problem: I define a < 0 and b < 0 (to intend that the sign is negative in both cases). Now I like to know the sign of the produkt of a*b, it should be positive by the hand. But how can I express it within mathematica 3.0? In general: how can I get the sign of an expression in symbolic form? In 1: Sign[a*b] ? Out 1: > 0 or positive. Many thanks for your help. Lothar Dillinger EMail: doellinger at t-online.de