Hmmm...
sage: assumptions()
[]
sage: (z-4*conjugate(z)).simplify()
-3*z
sage: assume(z,"complex")
sage: (z-4*conjugate(z)).simplify()
z - 4*conjugate(z)
Explicitly telling "var(z,"complex") has the same effect... This seems
directly inherited from Maxima :
(%i29) ratsimp(z-4*conjugate(z));
This is probably related to the following:
sage: var('z')
z
sage: (z - 4*z.conjugate()).simplify()
-3*z
which is a bug, given that the documentation of var says:
By default, var returns a complex variable
Eric.
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