Writings

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An expository note on the notions of curvature and torsion of a general linear connection on the tangent bundle.
Last updated on 12 min read mathematical diversions

About the Einstein-Infeld-Hoffmann theorem characterizing geodesics.
Last updated on 5 min read expository

The Kempner series recently regained some notoriety due to a Saturday Morning Breakfast Cereal comic (the last panel). The observation …
Last updated on 3 min read expository

One of my current research interests is in the geometry of constant-mean-curvature time-like submanifolds of Minkowski space. A special …
Last updated on 8 min read mathematical diversions

Numpy simulation of how classical and quantum particles interact with potential barriers.
Last updated on 8 min read mathematical diversions

Expository article on the geometric notion of derivatives.
Last updated on 1 min read expository

A converse to Banach's fixed point theorem, due to Bessaga, is discussed.
Last updated on 5 min read expository

We explain how to conformally compactify pseudo-Euclidean spaces with $(p,q)$ signature.
Last updated on 4 min read expository

Lecture slides that Gustav Holzegel and I used for the January 13-14, 2014 OXPDE Workshop at Oxford University.
Last updated on 2 min read expository

Expository note on the Runge phenomenon
Last updated on 1 min read expository