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/