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Re: Domains

  • To: mathgroup at smc.vnet.net
  • Subject: [mg85341] Re: Domains
  • From: Szabolcs <szhorvat at gmail.com>
  • Date: Wed, 6 Feb 2008 06:37:20 -0500 (EST)
  • References: <foavks$hn3$1@smc.vnet.net>

On Feb 6, 1:39 am, Akki <lodhaakhi... at gmail.com> wrote:
> Hi,
>
> How does one create a domain for a variable in Mathematica ?
>
> For e.g. x is a variable and I would like to create a domain for x
> consisting  of 3, 5, 7 only.
> i.e. dom = {3,5,7} then use the condition \Element[x,dom]

Hi,

If you would like to use this variable in functions like Reduce, you
could try the expression (x==3 || x==5 || x==7) (or generating this
automatically from the list {3, 5, 7}:  Or@@(x==#& /@ {3,5,7}) ).

Szabolcs


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