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Another question on Assuming

• To: mathgroup at smc.vnet.net
• Subject: [mg85866] Another question on Assuming
• From: "Kevin J. McCann" <Kevin.McCann at umbc.edu>
• Date: Tue, 26 Feb 2008 07:42:34 -0500 (EST)
• Organization: University System of Maryland

The first example in the Mathematica Help on Assuming is (in part)

Assuming[a > 0, Refine[Sqrt[a^2]]]

which results in the answer a, as it should; however if I type instead

Assuming[a > 0, Sqrt[a^2]]

I get back Sqrt[a^2]], but I should get a, since there is no other 
correct answer, because the assumption that a > 0 implies that it a is a 
positive real.

Bug?

Kevin
-- 

Kevin J. McCann
Research Associate Professor
JCET/Physics
Physics Building
University of Maryland, Baltimore County
1000 Hilltop Circle
Baltimore, MD 21250

• Follow-Ups:
  • Re: Another question on Assuming
    • From: Andrzej Kozlowski <akoz@mimuw.edu.pl>