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test positive

• To: mathgroup@smc.vnet.net
• Subject: [mg12083] test positive
• From: mam94006@uconnvm.uconn.edu (Manuel A. Morales)
• Date: Sat, 25 Apr 1998 01:30:18 -0400
• Organization: University of Connecticut

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

For example, consider the trivial case:

f=x*y

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
xy>0.

Thanks,
Manuel