MathGroup Archive 1998

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test positive

I want to test whether a function is always positive for a given set of
parameter values.

For example, consider the trivial case:


Is there a way to test whether x*y is positive given that x is greater
than 0 and y is less than 0 or both x and y are greater than 0, etc.,
or better yet to solve for the specific conditions that will yield


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