cff-version: 1.2.0
message: "If you use this research release, please cite the repository revision and the accompanying manuscript."
title: "Hsin-Heart Exact 84: Two-Intersection Families on 21 Points — Exact Bound, Rigidity, and Stability"
type: software
version: "1.0.0-candidate"
date-released: 2026-09-11
repository-code: "https://huggingface.co/datasets/PureOne/hsin-heart-exact84-two-intersection"
url: "https://huggingface.co/datasets/PureOne/hsin-heart-exact84-two-intersection"
keywords:
  - extremal combinatorics
  - coding theory
  - finite geometry
  - Johnson scheme
  - PG(2,4)
  - reproducible mathematics
license: "CC-BY-4.0 AND MIT"