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[MUG] Re: Curious simplification
| [MUG] Re: Curious simplification |
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Author: Carl Devore
Posted: Wed, 11 Dec 2002 01:37:12 -0500
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>> From: Carl Devore "devore"
On Thu, 5 Dec 2002, Greg Gamble wrote:
> ... so this suggests using {solve(...)} to compare such expressions.
> However, if one tries this with <> one gets:
> > solve(x<>2);
> x
> (which means `any value' as I interpret it) and differs from:
>
> > solve(x < 2 or x > 2);
> RealRange(-infinity, Open(2)), RealRange(Open(2), infinity)
Because of complex numbers, 'x<>2' is not the same as 'x>2 or x<2'. But
if you include a trivial directional inequality in the solve, it will
"reduce" the inequalities:
> solve( {x<>2, x<infinity} );
{x<2}, {2<x}
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