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Problems with simplify and Sqrt[a^2]

• To: mathgroup at smc.vnet.net
• Subject: [mg73845] Problems with simplify and Sqrt[a^2]
• From: dshortho <david.shorthouse at credit-suisse.com>
• Date: Fri, 2 Mar 2007 06:22:53 -0500 (EST)

any help on this one:

if you type in:
v3/Sqrt[v1^2]/Sqrt[v2^2] - v3/v1/v2

you get the same expression

Even if you then type
Simplify[%]

you still get the same expression

I would have thought Mathematica would have resolved Sqrt[v1^2] to v1 (!?)

Does anyone out there know why it does not do this, as it is causing some problems with some proofs I am doing ?