Re: Why isn't Expand[] grouping terms by order?

*To*: mathgroup at smc.vnet.net*Subject*: [mg87862] Re: Why isn't Expand[] grouping terms by order?*From*: Peter Breitfeld <phbrf at t-online.de>*Date*: Sat, 19 Apr 2008 03:31:35 -0400 (EDT)*References*: <fu9fq7$cbn$1@smc.vnet.net>

<p at dirac.org> schrieb: > Consider this: > > In[19]:= Expand[ (1+a*x)*(1+b*x), x] > > 2 > Out[19]= 1 + a x + b x + a b x > > > How can I coax Mathematica to give me this, instead: > > 2 > Want[19]= 1 + (a + b) x + a b x > > Why isn't Mathematica reporting the answer in terms of powers of x? > > Thanks! > expr = (1 + a x) (1 + b x) Collect[expr,x] Gruss Peter -- ==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-== Peter Breitfeld, Bad Saulgau, Germany -- http://www.pBreitfeld.de