MathGroup Archive 1990

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Problem defining delta function

  • To: uiucuxc!!mathgroup
  • Subject: Problem defining delta function
  • From: uiucuxc!!mcdonald (Bill MacDonald)
  • Date: Thu, 15 Mar 90 17:45:20 EST

I began to try to define the delta function, but the first step fails. Why?
  delta/: delta[x_]f_[x_]:=delta[x]f[0]
Then if
and I try
Mathematica simply gives back
  (-a + x)^2 delta[x]
What is wrong ?  

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