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

• To: mathgroup at smc.vnet.net
• Subject: [mg122293] Re: how do you prevent numerator expansion when using 'Together'?
• From: DrMajorBob <btreat1 at austin.rr.com>
• Date: Sun, 23 Oct 2011 06:26:45 -0400 (EDT)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com

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)

Bobby

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 ]
>


-- 
DrMajorBob at yahoo.com