How to make "Is x zero or nonzero?" in my function

• Subject: How to make "Is x zero or nonzero?" in my function
• From: Evgeniy Maevskiy
• Date: Mon, 11 Jun 2012 11:11:46 +0300

In my Maxima-function I have to ask the user

Is x zero or nonzero?
Is x positive or negative?

Something like in the computation of integrate(t^x,t)

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