Feynman diagrams without any physics
Feynman diagrams are associated with complicated physics, but they can also be found hiding in relatively simple questions about Gaussian random variables. Read more
Layout algorithms for flexigrids
An exposition of the elastic coordinate system used in fletcher. Read more
Expression Synth 🎶
An expression-based key-controlled synthesizer in your browser. Read more
French verb conjugations quizzer
An app to help you practice conjugating French verbs. 🇫🇷 Read more
Basic general relativity with Julia
Four years after I took general relativity, my professor asked me to send him an old animation I had made during his course showing parallel transport of vectors around a line of latitude on the sphere. Actually, I wasn’t the one who had made it (though I was flattered that he had thought so!)
The tool I reached for was Julia. To my delight, the whole thing was rather simple to make. This was the humble result:
Read moreDefining Entropy with a Composition Law
My favourite characterisation of (information) entropy with a ‘composition law’, and a uniqueness proof. Read more
Daylight Hours: A spherical geometry problem
How many hours are there between sunrise and sunset? The Earth’s tilt makes this a fun geometry problem… Read more
Billiard geometry: Visually solving elastic collisions
A neat relationship between elastic collisions and ellipses. Read more