Misc
Small web experiments, friends' pages, academic photobombs, and where the older notes went.
Web apps
Processing / p5.js sketches and simulations that run in the browser.
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Simulation
GenericAlgoid
A toroidal evolution sandbox with organisms, resources, terrain, mutation, and visible lineages.
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Fractal
Interactive IFS Fractal
An interactive iterated-function-system sketch with movable affine maps, contraction, rotation, and depth controls.
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Simulation
Hydraulic Erosion
A particle-based hydraulic erosion simulation where raindrops follow water-adjusted slopes and carry or deposit soil.
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Simulation
Three-level Ecosystem
A three-level ecosystem simulation in which plants, herbivores, and carnivores seek food, consume nutrients, and reproduce.
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Evolution
Evolutionary Prisoner's Dilemma
An evolutionary repeated Prisoner's Dilemma with 128-state strategies, all-pairs tournaments, crossover, and strategy injection.
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Evolution
Evolving Walkers
A genetic-algorithm sketch that evolves 100-step movement genes by rightward fitness, crossover, and mutation.
Academic photobomb
Places where I appear in someone else's work: acknowledgements, events, and the occasional magazine.
- 20 October 2025大学への数学 2025年11月号 数理空間トポス
- 10 October 2025数学セミナー2025年11月号 圏論の質問箱
- 6 July 2025On the theories classified by an étendue
- 7 March 2025Algorithmic Foundations for Social Advancement
- 29 July 2024On iterated circumcenter sequences
- 28 February 2024組合せゲーム理論の世界
- 22 November 2023Quadratic residues and domino tilings
- 10 October 2023On variations of Yama Nim and Triangular Nim
- 22 September 2023数理物理ラジオ第16回 ゲスト: ほらさん
- 11 September 2023Filtered colimit elimination from Birkhoff's variety theorem
- 26 May 2023数理空間トポス 5周年記念公開イベント
- 20 April 2016数学ガールの秘密ノート 場合の数
- Older notes (Notion) — Older documents are collected on Notion.
- Old site (Google Sites, stale)