This notation is frequently used in physics. the dk just means dkdkdk so it's a triple integral. Unfortunately i don't know how to helo you with the evaluation.
Hi folks, I am having some trouble with an integral involving a delta function. I have been working with calculus for many years and have never seen the particular notation given in the following integral, I am quite confused by the .
Notice this is an integral over the dirac delta function and it spits out a unit step function (Theta).
Can someone please explain what it means by and perhaps a few steps between the integral and the solution? Thanks.