Re: Defining a custom Leibnitz operator in Mathematica

*To*: mathgroup at smc.vnet.net*Subject*: [mg92353] Re: Defining a custom Leibnitz operator in Mathematica*From*: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>*Date*: Sun, 28 Sep 2008 07:22:53 -0400 (EDT)*Organization*: The Open University, Milton Keynes, UK*References*: <gbmphp$htu$1@smc.vnet.net>

GidiL wrote: > Dear All! > > I would appreciate any input on the following problem. > > I would like to define a custom differential operator with the > following properties: > > 1. it would be denoted with a customized symbol that I would create > (e.g. the Greek letter \delta, or any combination, such as \bar > {\delta}); > > 2. it would possess the Leibnitz property of differentiation; > > 3. it would be possible to define its action a priori on certain > elements (e.g. \delta of a constant would be zero, etc.). > > Any help would be greatly appreciated. > > Thanks, > > Gideon > Hi Gideon, The following tutorial, "An Example: Defining Your Own Integration Function," available online and at http://reference.wolfram.com/mathematica/tutorial/AnExampleDefiningYourOwnIntegrationFunction.html should tell you all, assuming your are comfortable enough with pattern matching. If more info are needed, see "Patterns" either online or at http://reference.wolfram.com/mathematica/tutorial/PatternsOverview.html Regards, -- Jean-Marc