Re: differentiation operator

*To*: mathgroup at smc.vnet.net*Subject*: [mg100662] Re: differentiation operator*From*: dh <dh at metrohm.com>*Date*: Wed, 10 Jun 2009 17:10:59 -0400 (EDT)*References*: <h0nulh$be1$1@smc.vnet.net>

Hi Chee, I did not thoroughly test it, but if you define: $Pre = # /. Times[ d expr_ Power[dx, -1]] :> D[expr, x] & the following examples work: d/dx x^2 -> 2x d/dx Sin[x] -> Cos[x] d/dx (x-x^3) -> 1-3x^2 e.t.c Daniel Chee Lim Cheung wrote: > Hi All > > My students have asked me whether it is possible to define the operator > df[x]/dx for differentiation rather than D[f[x],x]. The operator is > available in a palette but it does not seem to do anything other than for > display only. > > Example: d/dx(x^2)=2x rather than D[x^2,x]=2x. > > Am I missing something? > > Thanks > Mr. Chee >

**Follow-Ups**:**Re: Re: differentiation operator***From:*Murray Eisenberg <murray@math.umass.edu>