Re: [sage-support] Re: Problem with a derivative of order k in a summation in k

2014-05-16 Thread Bruno
Thanks for your help. 2014-05-15 12:09 GMT-04:00 Nils Bruin nbr...@sfu.ca: 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

[sage-support] Re: Problem with a derivative of order k in a summation in k

2014-05-15 Thread Nils Bruin
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