Transfinite NIM (the game, not the programming language)

How the continuum hypothesis could have been a fundamental axiom

The propagation of error in classical geometry constructions (2018)

Transfinite game values in infinite chess

Coming to Agreement, a logic puzzle for Oxford admissions interviews

A program that accepts exactly any desired finite set, in the right universe

Transfinite Nim

Math for eight-year-olds: graph theory for kids

Math for 7 year-olds: graph coloring, chromatic numbers, Eulerian paths etc.