PowerExpand
- To: mathgroup at smc.vnet.net
- Subject: [mg63537] PowerExpand
- From: "Blimbaum, Jerry CIV NSWC PC" <jerry.blimbaum at navy.mil>
- Date: Wed, 4 Jan 2006 03:17:14 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
- Thread-index: AcYQsFUAKHiJwoSiQf6H6XDPKu9E6Q==
Just want to make a comment.....Normally PowerExpand is looked upon as a culprit because for the general case it leads to wrong results......However, I had an interesting case where I tried Siimplify[expr, m>0] ....expr was of 2 basic forms (although really more complicated then this, but this shows the basic idea) .....Sqrt[-m^2 (a^2+b^2)] and Sqrt[m^2 (a^2+b^2)] With Simplify Mathematica cranked and cranked and cranked with no output.....So , in frustration, I tried PowerExpand and a second later it performed the same operation with surprising ease and the result was exactly what i was trying to get... If I try the basic expressions , then Simplify took m out of the Square Root sign for the Sqrt[m^2 (a^2+b^2)] but not for Sqrt[-m^2 (a^2+b^2)] jerry blimbaum
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