# Please i need help and fast!

by momen salah
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 HW Helper P: 2,616 Did you try Wikipedia? http://en.wikipedia.org/wiki/Dirac_delta_function $$L(\delta(t-a)) = e^{-as}$$ Let a=0. And there you have it.
 Math Emeritus Sci Advisor Thanks PF Gold P: 39,497 The "Dirac delta function" is more commonly called just "the delta function". It is not, in fact, a "function" but rather a "generalized function" or "distribution". Roughly speaking that's a that's a functional: an operator that assigns a number to every function. The delta function assigns the number f(0) to every function f (so $\delta(t- a)$ that Defennnder show assigns the number f(a) to every function f).