user45664

 1 Wave equation - initial displacement is box function 1 Proof of Huygens Principle 1 Where is the wild use of the Dirac delta function in physics justfied? 1 What do we do with the dummy variable in d'Alembert's wave equation? 1 Lighthill explanation of delta function/generalized functions

### Reputation (305)

 +5 Terminology: 'Definite' or 'Indefinite' integral? Wiki vs Visual Calculus +10 Dirac Delta distribution (function) confusion +10 Confused with a spherical coordinate system surface element +10 Proof of Huygens Principle

### Questions (15)

 2 Dirac Delta distribution (function) confusion 2 Confused with a spherical coordinate system surface element 2 Proper use of various derivative and partial derivative notations 2 Can all linear operators on functions be represented as a convolution of the input function with the operator's impulse response? 2 Can the Dirac Delta, $\delta$, be obtained by taking the limits of a rectangular pulse?

### Tags (38)

 4 dirac-delta × 15 1 wave-equation × 3 3 pde × 5 1 mathematical-physics × 3 1 distribution-theory × 8 1 definition × 2 1 functional-analysis × 5 1 fourier-analysis 1 reference-request × 3 1 real-analysis

### Accounts (6)

 Physics 1,394 rep 22 gold badges1010 silver badges2727 bronze badges Mathematics 305 rep 22 silver badges1313 bronze badges Signal Processing 113 rep 55 bronze badges History of Science and Mathematics 113 rep 55 bronze badges MathOverflow 101 rep 11 bronze badge