Re: simplifying complex polynomials

*To*: mathgroup at smc.vnet.net*Subject*: [mg13771] Re: simplifying complex polynomials*From*: Wouter Meeussen <eu000949 at pophost.eunet.be>*Date*: Mon, 24 Aug 1998 05:07:20 -0400*Sender*: owner-wri-mathgroup at wolfram.com

Daniel, lets create a sum of terms: fa:=Apply[Plus,Table[(-1)^Random[Integer,{0,1}] y@@Table[Random[Integer,{-1, 1}],{3}] ,{36},{4}],1] ad let's make a rule: ruletwo=( a_Plus /;!MatchQ[(Plus@@(a/. -q->q/.Plus->List/. y->List)),{2,_,_}] ->{}) let's create a sample: fa (#/.ruletwo&)/@% %~DeleteCases~{} this gives the list fa cleaned up. wouter At 04:39 15-08-98 -0400, Daniel H. Steinberg wrote: >A friend of mine is trying to simplify polynomials which are sums of >monomials each of which is the product of terms which are y_[] and z_[] >where the [] is a vector like [1,1,2,1,5]. > >Her simplification rules are fairly straightforward -- but how do you >get Mathematica to do it. >