Re: Simplification question
- To: mathgroup at smc.vnet.net
- Subject: [mg59072] Re: Simplification question
- From: Peter Pein <petsie at dordos.net>
- Date: Thu, 28 Jul 2005 02:26:29 -0400 (EDT)
- References: <dc76pp$jvg$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
snoofly schrieb: > Can someone explain this to me please. > > Clear[m] > > Simplify[Sin[3 m Pi], Assumptions -> m \[Element] Integers] > 0 > > Simplify[Cos[3 m Pi], Assumptions -> m \[Element] Integers] > > Cos[3 m \[Pi]] > > I'm not sure why Mathematica cannot deduce that the second simplification > should be (1)^m. > see http://groups.google.com/groups?selm=dc16i2%246q5%241 at online.de&rnum=1 the behaviour of Mathematica is rather strange (in my eyes): FullSimplify[(-1)^(3*m), m \[Element] Integers] yields Cos[3*m*Pi] -- Peter Pein Berlin http://people.freenet.de/Peter_Berlin/