I can remember from Differential Equations that any function convolved with a delta function results in a copy of the function located at the impulese. That is, [tex]x(t) * \delta(t-5) = x(t-5)[/tex] However, I can't remember why. This is really irritating me since I need to use this concept for my courses, yet I can't remember why this is true. This makes sense... but I get stuck when trying to evaluate the following integral: [tex]\int_0^t \delta(t - \tau) d \tau[/tex] Any help would be appreciated. Thanks!