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Re: problem with mathematica :(

  • To: mathgroup at smc.vnet.net
  • Subject: [mg98561] Re: problem with mathematica :(
  • From: Szabolcs Horvát <szhorvat at gmail.com>
  • Date: Mon, 13 Apr 2009 03:31:10 -0400 (EDT)
  • References: <grs6c7$qjg$1@smc.vnet.net>

olfa wrote:
> Hi Mathematica community,
> I have this system of equations:
>  Reduce[{i >= iP, v + a*t/(1 - d) == vP + a*tP/(1 - d),
>           t/d^(x/a) == tP/d^(xP/a), a*i + 1*x == a*iP + 1*xP,
>           t/d^(i/-1) == tP/d^(iP/-1),
>           z - c*x*(x - a)/(2*a) == zP - c*xP*(xP - a)/(2*a),iP==0},
> {iP,tP,vP,xP,zP},Backsubstitution->True]
> But mathematica still in running until I abort.Could you tell me what
> is the problem?

Remove the inequality unless you really need it.  It makes the problem 
much much more difficult.


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