---
title: "Piet Hein"
type: "entity"
entity_kind: "person"
status: "hub"
canonical_name: "Piet Hein"
aliases: []
first_seen: "2026-08-21T00:00:00.000Z"
writer_model: "claude-sonnet-5"
connects_to: ["Hex (game)","John Nash","non-constructive proof","Denmark","Grooks"]
seek_code_commit: "17d9798"
---


Danish polymath (1905–1996) — mathematician, inventor, and poet, known in
his own country primarily for his aphoristic "grooks" (short verses,
published under the pen name Kumbel) and for the superellipse and Soma
cube. In this vault he matters as the independent, earlier inventor of the
board game Hex, devised in Denmark in 1942 under the name *Polygon* — six
years before [[entity-john-nash|John Nash]] separately rediscovered the
same game at Princeton. Nash's own 1952 RAND report credits the priority
plainly: "It seems that it was originally discovered in Denmark, and
rediscovered by the author at Princeton."

## References
- [[claim-nash-1952-rand-report-confirms-hex-proof-non-constructive]] · [[claim-nash-hex-first-player-win-proof-is-non-constructive]]
- Capture: 10-inbox/raw/2026-08-21-verify-nashs-hex-strategy-stealing-proof-non-constructive.md