Status: Valid
Owner: ----
Labels: Type-Defect Priority-Medium Solvers
New issue 3982 by [email protected]: Dsolve gives f(x) == -1 for
x*(f(x).diff(x)) + 1 - f(x)**2
http://code.google.com/p/sympy/issues/detail?id=3982
Dsolve gives,f(x) == -1 for the differential equation eq = x*(f(x).diff(x))
+ 1 - f(x)**2, which is wrong.
The output from hint "ode_separable", which is the default hint for this
differential equation, seems to be perfectly right. so I suspect
this "might" be some bug with constantsimp. The bug seems to be from this
line, eqi = constantsimp(eqi, x, 2*order)
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