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Beginner-type question

• To: mathgroup at smc.vnet.net
• Subject: [mg4028] Beginner-type question
• From: lopez at oddjob.uchicago.edu (Rob Lopez)
• Date: Mon, 20 May 1996 02:14:51 -0400
• Organization: University of Chicago -- Academic Computing Services
• Sender: owner-wri-mathgroup at wolfram.com

I often encounter output of the form
	Out[1]= Sqrt[a^2] ,
where I know a is real and positive, and therefore would like to see
	Out[1]= a .
How do I get Mathematica to assume that all quantities are real? Real
and positive? Can this be done globally, for an entire session?

Thanks in advance.

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Rob Lopez
Department of Physics
University of Chicago
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