Taylor series should raise an error if derivative not defined.

[klui]

I think an error should be raised in the following example:

sage: f(x) = x**(1/3); f
x |--> x^(1/3)
sage: f.taylor(x,0,3)
x |--> x^(1/3)

[kcrisman]

I'm not familiar with this notation for Taylor polynomials (which is surprising) but anyway to make it clear:

f.taylor(x,0,3)
x |--> x^(1/3)

For what it's worth, f.series(x,3) gives an error.

[klui]

Replying to kcrisman:

I'm not familiar with this notation for Taylor polynomials (which is surprising) but anyway to make it clear:

f.taylor(x,0,3)
x |--> x^(1/3)

For what it's worth, f.series(x,3) gives an error.

[embray]

Ticket retargeted after milestone closed

[mkoeppe]

Moving tickets to milestone sage-9.2 based on a review of last modification date, branch status, and severity.

[mkoeppe]

Moving to 9.4, as 9.3 has been released.