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Topic: Re:[mg4144]More "Logical" functions?
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Edward G. Neuman

Posts: 13
Registered: 12/7/04
Re:[mg4144]More "Logical" functions?
Posted: Jun 16, 1996 2:13 AM
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Scott Herod wrote:

>I often find myself trying to solve big sets of polynomial equations.
>I realize that there are Groebner basis packages for use in this but
>many times I can get by with Reduce and Solve. My problem is this:
>Often I get results like
> {{ x -> 0 }, {x -> 0, y -> 5 }, {x -> 0, z -> -2}, ... }
>where {x -> 0} is common to all of the terms. I would like to be able
>to factor out the x=0 from each equation. I don't need to see everything
>else if x has to be zero anyway.
>Currently I'm doing a LogicalExpand[results && x != 0] to see the cases
>where x does not have to be zero, but something to factor the x -> 0
>would be nicer.
>Does anyone know of an existing package do Logical expression operations?
>Scott Herod

To delete from your list expressions like x->c, where c is a number, you can
use the rewrite-rule capability of Mathematica:

{{}, {y -> 5}, {y -> 0}}

Edward Neuman Phone: (618) 453-6501
Department of Mathematics Fax: (618) 453-5300
Southern Illinois University E-mail:
Carbondale, Ill. 62901-4408

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