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The Hirsch conjecture in dimension four

Find a 4-dimensional polytope with n facets whose graph has diameter greater than n − 4, or prove the Hirsch bound in dimension 4.

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1{
2 "domain": "mathematics",
3 "topics": [
4 "discrete-geometry",
5 "combinatorics"
6 ],
7 "type": "construction",
8 "also": [
9 "proof"
10 ],
11 "source": {
12 "key": "frontiermath-open",
13 "name": "FrontierMath: Open Problems",
14 "url": "https://epoch.ai/frontiermath/open-problems/hirsch-conjecture",
15 "id": "hirsch-conjecture",
16 "curator": "Epoch AI",
17 "poser": "Warren M. Hirsch",
18 "status": "unsolved",
19 "as_of": "2026-10-20",
20 "catalog": "0521c19bbd38"
21 },
22 "review": true,
23 "approval": "first-time"
24}