Groups > comp.soft-sys.math.mathematica > #1586

Re: why this system cannot be solved!

From	Dana DeLouis <dana.del@gmail.com>
Newsgroups	comp.soft-sys.math.mathematica
Subject	Re: why this system cannot be solved!
Date	2011-04-11 11:05 +0000
Organization	Steven M. Christensen and Associates, Inc and MathTensor, Inc.
Message-ID	<inunab$2b8$1@smc.vnet.net> (permalink)

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On Mar 21, 7:18 am, olfa <olfa.mra...@yahoo.fr> wrote:
> Hi Mathematica community,
>
> I've tried to solve the variable xP in this system with Reduce over
> Integers,Reals and Complexe:
> 0 <= xP < a && Mod[x, a] == Mod[xP, a]

> unfortunately it cannot be solved .
>
> the output should be xP==Mod[x,a].

Hi.  Not sure if this helps.
Simplify[ Mod[xP, a], 0<=xP<a]
xP

equ= Mod[xP, a]==Mod[x, a];

Doesn=92t seem to work on the entire equation:
Simplify[equ,0<=xP<a]
Mod[x,a]==Mod[xP,a]

Seems to work on the parts:

Map[Simplify[#,0<=xP<a]&,  equ]
xP==Mod[x,a]

= = = =
Dana DeLouis=

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Re: why this system cannot be solved! Dana DeLouis <dana.del@gmail.com> - 2011-04-11 11:05 +0000

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