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Question: Derivative of a summation in order to a single term

Question:Derivative of a summation in order to a single term

ASchleck 15 Maple
derivative summation
June 07 2017
2

doubt.mw

Equation21v2.mw

 

Hi,

When I do the derivation of a summation in order to one single term should not the result come out of the summation in the example attached in the file doubt? for example the derivative should not have yielded Ci and not the summation of Ci because for example if want the derivative in order to y1 it should be only C1 and not the summation of Ci.

 

The same happen when I go to a more complex case like in the file Equation21v2, should the result in the last double summation before T drop the summation over i to NC?

 

Many thanks in advance for your help!


 
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