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MathGroup Archive 2006

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Re: How to get rid of If[ ... ] in a result

  • To: mathgroup at smc.vnet.net
  • Subject: [mg65175] Re: How to get rid of If[ ... ] in a result
  • From: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>
  • Date: Thu, 16 Mar 2006 06:22:47 -0500 (EST)
  • Organization: Uni Leipzig
  • References: <dvarv1$c1j$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

Assuming[Element[t/2, Integers],
If[Element[t/2, Integers], x, y] // Simplify
]

or

Refine[
If[Element[t/2, Integers], x, y] // Simplify,
Element[t/2, Integers]
]

or

If[Element[t/2, Integers], x, y] // Simplify[#, 
Element[t/2, Integers]] &

??

Regards

  Jens

"hanspi" <hanspi at schmid-werren.ch> schrieb im 
Newsbeitrag news:dvarv1$c1j$1 at smc.vnet.net...
| Dear Mathematica users,
|
| I often get results like the following when I do 
symbolic sums, in this
| case of a Sin[ ... ]:
|
| ... ... ... If[2/T Element Integers, x, y] ... 
...
|
| Now I know that 2/T is an Integer. How can I 
tell Mathematica that this
| is so, such that it removes the 'If'? It seems 
that Assumptions don't
| work for sums.
|
| Kind regards,
| Hanspeter
| 



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