Re: how do you prevent numerator expansion when using 'Together'?

*To*: mathgroup at smc.vnet.net*Subject*: [mg122273] Re: how do you prevent numerator expansion when using 'Together'?*From*: Dushan Mitrovich <dushanm at spinn.net>*Date*: Sun, 23 Oct 2011 06:23:03 -0400 (EDT)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com

DrMajorBob wrote: > Factor[(a + b)/d + ((a + b)*(e + f))/(d*g)] > > ((a + b) (e + f + g))/(d g) > > Together[(a + b)/d + ((a + b)*(e + f))/(d*g)] > > ((a + b) (e + f + g))/(d g) > > Yes, this simplified example does this on my system too, but the actual expression I have behaves the way I described. Your counter-example indicates there must be something in my actual expression that causes the behavior. I'll experiment to see what that might be. Thanks for pointing this out. - Dushan > On Sat, 22 Oct 2011 05:07:37 -0500, Dushan Mitrovich <dushanm at nnips.net> > wrote: > >> I'm using Mathematica 8. When using 'Together' on an expression the >> numerator >> is always expanded, complicating the appearance of the final result: >> >> In: Together[ (a+b)/d + ((a+b)*(e+f))/(d*g) ] >> Out: 1/(d*g) * (a*g + b*g + a*e + b*e + a*f + b*f) >> >> Instead, I'd much prefer the simpler form >> 1/(d*g) * (a+b)*(g+e+f) >> >> What do I need to do to get the latter form? Thanks. >> >> - Dushan >> [ reverse the middle word of address to reply ] >> > >