Hi all,

I'm working on a project, and my professor suggest I post a question
here.

I'm trying to use programs such as Mathematica, Maple and Sage to test
whether a function is always positive.  Maple has an "is" command,
which can be used to test some properties.  Sometimes it is
sufficient, other times it fails.

Does Sage have anything like an "is" command?  Is there any other way
to test if a function is always positve/negative?

Thanks

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