MathGroup Archive 2005

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Re: (x-y) DiracDelta[x-y] does not simplify to 0


Wolf, Hartmut writes:

 > In[14]:= f[x_,y_] := (1 + x + y + x^2)/(x - y)
 > 
 > In[15]:= Integrate[f[x,y]*(x - y)DiracDelta[x - y], {x, -Infinity,
 > Infinity}]
 > Out[15]= (1 + y)^2

OK, with this example I realize that Andrzej and Yehuda were probably
correct from the start, since with my simplification outside the
integral, and if not too careful, I might have deduced that this would
give 0.

Thanks again everybody,
Alain


  • Prev by Date: Re: A bug in Integrate ?
  • Next by Date: Re: Can I make permanent font settings in Mathematica 5
  • Previous by thread: Re: Re: (x-y) DiracDelta[x-y] does not simplify to 0
  • Next by thread: Re: assigning functions