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MathGroup Archive 2000

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Re: 'strange' simplification problems - why?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg22993] Re: 'strange' simplification problems - why?
  • From: John Doty <jpd at w-d.org>
  • Date: Sun, 9 Apr 2000 01:45:55 -0400 (EDT)
  • Organization: Wampler-Doty Family
  • References: <8cnv5c$5bp@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com


lobozc at my-deja.com wrote:

> a)  lmb^k*(mu^(-1))^k  is just a longwinded way of saying (lmb/mu)^k -
> and I get the long form also after FullSimplify. What am I doing wrong
> here? how could I get that to the simpler form? [short of replacing it
> by hand]
>

FullSimplify[] can't do this: it isn't always valid (see what happens when
{lmb->-1,mu->-1,k->1/2}). With integral k it's valid, so:

Simplify[lmb^k*(mu^(-1))^k ,Element[k,Integers]]

does what you want.

--
John Doty  "You can't confuse me, that's my job."
Home: jpd at w-d.org
Work: jpd at space.mit.edu




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