Re: Bug in Solve?
- To: mathgroup at smc.vnet.net
- Subject: [mg102980] Re: Bug in Solve?
- From: jsheinwald at comcast.net
- Date: Thu, 3 Sep 2009 07:09:17 -0400 (EDT)
- References: <h7l8rh$35s$1@smc.vnet.net>
Well I'm not a mathematician by trade, but I am a long time user of
Mathematica and I believe Mathematica. This quirk is mentioned in Michael
Trott's "The Mathematica Guidebook for Symbolics" page 95. Cubics with real
roots do this, but he does not give the theoretical explanation. You will
find
Solve[f[x]?0,x]
N[%]
{{x®3.80451 -4.44089×10-16 ä},{x®-3.938+0. ä},{x®0.133492 +4.44089×10-16
ä}}
Backsolving will show this works.