Hafsteinn Einarsson

The bootstrap percolation animation from the front page of this site, rebuilt as a native macOS screensaver with six color themes and a proper configuration sheet.

A small pipeline that records a session on a Zoom H1 Essential, transcribes the Icelandic audio with ElevenLabs, and renders each session as a graphic novel with gpt-image-2 and a set of reference images that keep the cast looking consistent across pages.

A simple, widely-used membrane-voltage model of biological neurons.

Modelling the percolation-with-inhibition process as a Markov chain on the potential of a single vertex, with an interactive D3 visualisation of the chain, a histogram of stopping times, and a running estimate of the probability of activation.

Adding inhibitory vertices to bootstrap percolation.

Bootstrap percolation without synchronous rounds — when edge delays are random the activity percolates much faster, in constant expected time.

A graph-based process that models the spread of activity in a network, with an interactive vis.js simulation on the Erdős–Rényi random graph.