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Newsgroups: comp.soft-sys.math.mathematica
From: Adam Strzebonski <ad...@wolfram.com>
Date: Sun, 28 Feb 2010 09:52:26 +0000 (UTC)
Local: Sun, Feb 28 2010 4:52 am
Subject: Re: Square root of a square
Andrzej Kozlowski wrote: It is a bug in V7.0. The function used by FullSimplify to > On 27 Feb 2010, at 09:13, Mariano Su rez-Alvarez wrote: >> Hi all, >> Mathematica evaluates FullSimplify[Sqrt[x^2]] to Sqrt[x^2], while it >> -- m > The second certainly not the answer I would expect, in fact this looks to me like a serious (perhaps even "shocking") bug. It certainly contradicts this answer: > FindInstance[Sqrt[x^2] != x, x] > {{x -> -(109/5) + (11*I)/5}} > Andrzej Kozlowski simplify equations involving holonomic functions does not handle branch cuts correctly. It can be disabled with In[1]:= Unprotect[Holonomic`HolonomicFullSimplify]; In[2]:= FullSimplify[Sqrt[x^2] == x] 2 Best Regards, Adam Strzebonski You must Sign in before you can post messages.
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