Hi folks,
Looks like sympy/dsolve produces an incorrect solution to an ODE:
from sympy import *
mass, g, b, t = symbols('mass g b t')
v, x = symbols('v x', cls=Function)
paraChute = mass*v(t).diff(t)-mass*g+b*(v(t))**2
solution = dsolve(paraChute,v(t),hint='lie_group')
solution
Out[1]:
Eq(v(t), sqrt(g)*sqrt(mass)/(sqrt(b)*tanh(sqrt(b)*sqrt(g)*(C1*mass +
t)/sqrt(mass))))
Sorry in advance if I'm doing something silly - the solution shouldn't be
1/tanh. Should be tanh.
--
You received this message because you are subscribed to the Google Groups
"sympy" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to sympy+unsubscr...@googlegroups.com.
To post to this group, send email to sympy@googlegroups.com.
Visit this group at https://groups.google.com/group/sympy.
To view this discussion on the web visit
https://groups.google.com/d/msgid/sympy/92f8fe37-45df-4cc0-9ebc-7330f0bb20d9%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
