systems of equations have to be put in curly brackets: Solve[ { a c e - a d h - b c h - b d e == a + c + e, b c e + a d e + a c h - b d h == b + d + h }, Integers] although don't you also want to be clear about which variables you're solving for? - Cris On Mar 26, 2015, at 12:43 PM, Dan Asimov <asimov@msri.org> wrote:
Can someone please explain why I got this error message:
----- In[40]:= Solve[a c e - a d h - b c h - b d e == a + c + e, b c e + a d e + a c h - b d h == b + d + h, Integers]
Solve::ivar: b c e + a d e + a c h - b d h == b + d + h is not a valid variable. -----
?
Thanks,
Dan _______________________________________________ math-fun mailing list math-fun@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun