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How to get sqrt(Year^2)===Year?

• To: mathgroup at smc.vnet.net
• Subject: [mg75724] How to get sqrt(Year^2)===Year?
• From: Hatto von Aquitanien <abbot at AugiaDives.hre>
• Date: Wed, 9 May 2007 04:33:05 -0400 (EDT)

If I have some expression which takes the square root of a square, it
evaluates leaving the whole square root expression unchanged.  

Year == (Year^2)^(1/2)

just returns what I entered when evaluated.

Year == Year

evaluates to True.

How do I persuade Mathematica to evaluate the first expression completely?
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• Follow-Ups:
  • Re: How to get sqrt(Year^2)===Year?
    • From: Sseziwa Mukasa <mukasa@jeol.com>