BSHM

Mathematics in Difficult Times: The Hidden Collaboration of Elli and Heinrich Heesch

An image of Elli Heesch at a desk with an isometric tiling drawn extending outwards from her pen

Have you ever heard of Elli Heesch (1904-1993), a German logician and philosopher who spent a brief research period at Princeton as a nun? You may have heard of her brother, Heinrich Heesch (1906–1995), a notable German mathematician recognised for developing the “discharging method”, which played a crucial role in the 1977 computer-aided proof of the four-colour theorem. However, the collaboration between Heinrich and Elli Heesch on tiling problems and their industrial applications during World War II remains largely unknown.

Meet the Council: Tom Briggs

Picture of Tom Briggs on a light green background alongside associated doodles (museum, cover of "The Mathematicians Library", dominoes, planet with stars)

At our Christmas 2025 AGM, we elected Tom Briggs as our newest ordinary council member. This blog introduces Tom, his interests and his journey into the history of mathematics! Who […]