Re: Derivation of Sums of Functions

*To*: mathgroup at smc.vnet.net*Subject*: [mg64806] Re: Derivation of Sums of Functions*From*: Jochen Haller <jhaller at gmx.de>*Date*: Sat, 4 Mar 2006 02:35:17 -0500 (EST)*References*: <du6nue$5pg$1@smc.vnet.net> <du841h$t25$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

No, I am looking for an easy construct to solve a problem like this: Derivate the sum from t=0 to T over the expression: x_t * (k_t - k_(t-1)) with respect to k_t, where the subscript means the index. JH