- #1

Ado

- 26

- 4

## Homework Statement

I need to integrate this expression :

P(k, w) = A * δ(w-k*v) * f(k, w)

A is constant and δ, Dirac Delta.

## Homework Equations

[/B]

There is double integration :

I = ∫

_{0}

^{∞}dk ∫

_{0}

^{∞}P(k,w) dw

= A ∫∫

_{0}

^{∞}δ(w-k*v) * f(k, w) dw dk

## The Attempt at a Solution

[/B]

I'm confused with Delta Dirac for calculating this integral.

Let us proceed the w-variable integration firstly. Since the δ-term impose w = k*v, we need to calculate :

∫

_{0}

^{∞}f(k=w/v, w) dw

But after that, there is no longer any k-dependence...

Of course I'm wrong.. can you explain me how to proceed ??

Thanks in advance !