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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: [mg65181] Re: [mg65149] How to get rid of If[ ... ] in a result
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Fri, 17 Mar 2006 00:13:25 -0500 (EST)
  • Reply-to: hanlonr at cox.net
  • Sender: owner-wri-mathgroup at wolfram.com

y=If[Element[x, Integers],y1,y2];

Simplify[y,Element[x, Integers]]

y1

Simplify[y,!Element[x, Integers]]

y2


Bob Hanlon

> 
> From: "hanspi" <hanspi at schmid-werren.ch>
To: mathgroup at smc.vnet.net
> Subject: [mg65181] [mg65149] How to get rid of If[ ... ] in a result
> 
> 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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