Re: DiracDelta Function question
- To: mathgroup at smc.vnet.net
- Subject: [mg21120] Re: DiracDelta Function question
- From: "Alberto Verga" <verga at marius.univ-mrs.fr>
- Date: Fri, 17 Dec 1999 01:21:18 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
The mathematica answer is "mathematically" correct! DiracDelta is a distribution, its intagral is 1, then when you change variables in the integral you must take into account the jacobian of the transformation: to pass from x to y==2x+2 the jacobian is just |dy/dx|^-1==1/2: delta(y(x))dx==delta(y)/|dy/dx| dy -- Alberto Verga - verga at marius.univ-mrs.fr Institut de Recherche sur les Ph=E9nom=E8nes Hors Equilibre. 12, av. G=E9n=E9ral Leclerc, 13003 Marseille, France. Tel: 33 (0) 4 91 64 44 76 - Fax 33 (0) 4 91 08 16 37