Re: Solve[] doesn't

*To*: mathgroup at smc.vnet.net*Subject*: [mg90635] Re: [mg90619] Solve[] doesn't*From*: Sseziwa Mukasa <mukasa at jeol.com>*Date*: Thu, 17 Jul 2008 05:34:15 -0400 (EDT)*References*: <200807161029.GAA08789@smc.vnet.net>

On Jul 16, 2008, at 6:29 AM, Hauke Reddmann wrote: > This is extremely annoying. > I have a very large (this seems to be critical) equation > system. It's partly linear, partly horror, but already > after I solve the linear part, a certain solution (which > is obviously one since substituting it in makes all equations > identical zero) can't be found anymore. The solution has some > surds (this also seems critical, the ones without are found) > but the equations are strictly polynomic. > > Faked Example (the real one only PM-ed, since it's a bit > oversized): > > x-y=1 > x^2+y^2=3 > x^3-y^3=4 > and after y was eliminated, it doesn't find x. (=golden mean here) > > Huh? The system has no problems for me: In[9]:= Solve[{x-y==1,x^2+y^2==3,x^3-y^3==4},{x,y}] Out[9]= {{x->1/2 (1-Sqrt[5]),y->1/2 (-1-Sqrt[5])},{x->1/2 (1+Sqrt [5]),y->1/2 (-1+Sqrt[5])}} Your problem would probably be clearer if you used Mathematica notation. Regards, Ssezi

**References**:**Solve[] doesn't***From:*Hauke Reddmann <fc3a501@uni-hamburg.de>