Re: wierd Log[0] *0 result

*To*: mathgroup at smc.vnet.net*Subject*: [mg9125] Re: wierd Log[0] *0 result*From*: Bill Bertram <wkb at ansto.gov.au>*Date*: Mon, 13 Oct 1997 23:33:36 -0400*Organization*: ANSTO*Sender*: owner-wri-mathgroup at wolfram.com

Patrick Tao wrote: > > Hello mma users, > > I have a quick question on the following computation: > > the natural log of 0 times 0 writen Log[0]*0 > > Should that not be 0 ? > > mma is returning an Indeterminate result mma evaluates that as -Infinity times Zero and doesn't know what kind of Infinity and what kind of Zero it is dealing with. You should use something like Limit[x Log[x], x ->0] which dous yield 0. Cheers, Bill