Writings

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Since the COVID-19 crisis and the university moving to online instruction, I've spent too much time programming WeBWorK assignments. …

L. Craig Evans is a professor at UC Berkeley. For many students he is best known for his textbook on partial differential equations. I …

Let's start with something simple: Given a circle with radius $R$, draw a concentric circle with radius 1 larger. How much longer is …

When does a polynomial with real coefficients have only real roots? Here's one way to determine it.

Driving down the highway in upstate Michigan yesterday, I saw a State Police billboard that states (I paraphrase) Drivers who text are …

Here's a slightly non-obvious relation between some angles, that I ran into accidentally. Claim: (angles below given in degrees) \[ …

A short note about an implicit assumption behind the notion of expectation values, and how it relates to economics applications.

I try to reformulate an idea of Capoferri and Vassiliev in the infinitesimal limit and see where it goes.

A follow up to my previous post on Young's inequality.

Some introductory notes about the definition and geometry of Lie groups, and their analysis.