Comment #5 on issue 1468 by smichr: problems with quartic root solver http://code.google.com/p/sympy/issues/detail?id=1468
There is a sign error in the original routine when there are not 4 real roots. The definitions of A and B when there are 2 or 4 complex roots should be A = (u-v)/4 B = (u+v)/4 The routines definitions are perhaps right as long as there are 4 real roots. I'm looing into that. /c -- You received this message because you are listed in the owner or CC fields of this issue, or because you starred this issue. You may adjust your issue notification preferences at: http://code.google.com/hosting/settings --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sympy-issues" group. To post to this group, send email to sympy-issues@googlegroups.com To unsubscribe from this group, send email to sympy-issues+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sympy-issues?hl=en -~----------~----~----~----~------~----~------~--~---