On Thursday, May 15, 2014 6:03:04 AM UTC-7, Bruno wrote:
>
>
> somat=sum( (((t-a)**k)/factorial(k))*((derivative(s,t,k)).limit(t=1))
> ,k,0,3)
>
This is unfortunately rather subtle. The problem is that your notation
derivative(s,t,k) clashes with the also accepted notation for the double
derivative of s with respect to t and then to k, so it's not possible in
sage presently to specify the k-th derivative for a symbolic k. So you need
to not write that. Instead, you can use a python iterator to write out the
sum completely, instead of trying to construct a symbolic sum. The notation
is very close, but the meaning is completely different:
somat=sum( (((t-a)**k)/factorial(k))*((derivative(s,t,k)).limit(t=1)) for k
in [0..3])
In this expression, k is never a symbolic variable (so you wouldn't need
the var('k') declaration). It's a python variable, taking the values
0,1,2,3 sequentially.
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