n(th) Derivatives of unknown Functions

*To*: mathgroup at smc.vnet.net*Subject*: [mg4661] n(th) Derivatives of unknown Functions*From*: von_Aschen at uni-duisburg.de (Harald von Aschen)*Date*: Thu, 22 Aug 1996 03:55:14 -0400*Organization*: Gerhard-Mercator-Universitaet GHS Duisburg Germany*Sender*: owner-wri-mathgroup at wolfram.com

Hi, Consider F to be an unknown function. I would like to solve d^s / dx^k F[2 x - a] (a is a constant, F a function with real numbers as input and real numbers as output, (no vectors)). With D[ F[2 x - a], {x, s} ] as Mma-Input I don't get the result (s) 2^s F [2 x - a] Is there any way to work around? Thanks for an answer! ==== [MESSAGE SEPARATOR] ====