Short Musing

Sometimes a post is just a germ of an idea, a fleeting thought that leads to nowhere in particular. These posts are short.

Random thought: Poohsticks illustrates well Lie differentiation

Life is boring in low dimensions.

It is fairly well known that experts in partial differential equations and experts in harmonic analysis prefer to define the Fourier …

A bit of trivia (can't think of any use of it now) Theorem   Let $(M,g)$ be a two-dimensional compact Riemannian manifold with …