It happened many times that I cannot figure out which unit system I’m using in my derivation. Should I put a hare, or should I include a there? It seems that I need to make a conclusion for these two unit systems, this article is based on the appendix of Jackson’s Classical Electrodynamics.

# Month: November 2016

## Legendre Transformation

Legendre Transformation is the transformation of a convex function, which produces a new function of a new variable.

## Methods of Mathematical Physics – Green’s Function for Helmholtz Equation

The first time I learn Green’s function is about 5 years ago, but never have the chance to use it to solve a practical problems. I always feel my foundation in this part is superficial every time I encounter this widely used function. Fortunately, our professor of Methods of Mathematical Physics provided profound instruction on […]