# Revision history [back]

### Taylor expansion twice for a general function cause problem?

Hi,

I met a problem when expanding a general function twice:

f = function('f',var('x')) g = f(x=var('eps')*y) h = taylor(g, eps, 0, 1) taylor(h, eps, 0, 1)

The last expression ends up with an error: NotImplementedError: arguments must be distinct variables

Is it a bug or I got anything wrong? Thanks!

### Taylor expansion twice for a general function cause problem?

Hi,

I met a problem when expanding a general function twice:

f = function('f',var('x'))
g = f(x=var('eps')*y)
h = taylor(g, eps, 0, 1)
taylor(h, eps, 0, 1)1)


The last expression ends up with an error: NotImplementedError: arguments must be distinct variables

Is it a bug or I got anything wrong? Thanks!

 3 No.3 Revision kcrisman 12122 ●39 ●128 ●248

### Taylor expansion twice for a general function cause problem?

Hi,

I met a problem when expanding a general function twice:

y = var('y')
f = function('f',var('x'))
g = f(x=var('eps')*y)
h = taylor(g, eps, 0, 1)
taylor(h, eps, 0, 1)


The last expression ends up with an error: NotImplementedError: arguments must be distinct variables

Is it a bug or I got anything wrong? Thanks!