Re: How to save time with InequalitySolve

*To*: mathgroup at smc.vnet.net*Subject*: [mg30326] Re: [mg30305] How to save time with InequalitySolve*From*: Andrzej Kozlowski <andrzej at tuins.ac.jp>*Date*: Sat, 11 Aug 2001 03:39:48 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

Probably you can't. When your inequalities contain more than one variable and expressions which are neither polynomials nor rational functions you should consider yourself lucky if you ever obtain an explicit solution. The same by the way applies to equations. (This is not a computer algebra problem but a mathematical one). Andrzej Kozlowski Toyama International University JAPAN http://platon.c.u-tokyo.ac.jp/andrzej/ On Wednesday, August 8, 2001, at 02:33 PM, Nathan ZYLBERSZTEJN wrote: > Hi, > > I want Mathematica to solve this system of inequalities. When I try > the following expressions, Mathematica is gone for hours and never > stops. How can I solve my system in a reasonable time? > > > InequalitySolve[ > -((-8*c*(-1 + d) + Sqrt[2 - 2*d]* > Sqrt[-4*c^2*(-2 + 5*d) + 3*d*(2 - 3*d + d^2)])* > (-4*c^2*(2 + d) + 3*d*(2 - 3*d + d^2) + > 2*c*Sqrt[2 - 2*d]*Sqrt[-4*c^2*(-2 + 5*d) + > 3*d*(2 - 3*d + d^2)]))/(54*c*(-2 + d)^2*d* > (-1 + 2*c + d)) > (4*Sqrt[2/3])/3 && 1 > c > 0 && > 1 > d > 0, {d, c}] > > Thanks a lot > > Nathan ZYLBERSZTEJN > >