> ivars = set(dvar.arguments()).intersection(extract_var_from_diff(de))
I forgot to make intersection in first patch. Changes are in the
second one.
It helps us to solve
sage: x,t=var('x
t')
sage:
f=function('f',x)
sage:
g=function('g',t,x)
sage: de=diff(f,x)+f+diff(g,t,x)
sage: desolve(de,f)
(c - integrate(e^x*D[0, 1](g)(t, x), x))*e^(-x)
without specifying of independent variable.
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