Pith Number

pith:AJZEWU4G

pith:2026:AJZEWU4GHXPOM4SJ6XQKPKGIPW

not attested not anchored not stored refs pending

Extremality of tautological classes of matroids in nef cones

Colin Stastny

arxiv:2606.01278 v1 · 2026-05-31 · math.AG · math.CO

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{AJZEWU4GHXPOM4SJ6XQKPKGIPW}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-06-02T02:04:28.669666Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

02724b53863ddee67249f5e0a7a8c87db746194620e3ed5ca0b1765bc22ae073

Aliases

arxiv: 2606.01278 · arxiv_version: 2606.01278v1 · doi: 10.48550/arxiv.2606.01278 · pith_short_12: AJZEWU4GHXPO · pith_short_16: AJZEWU4GHXPOM4SJ · pith_short_8: AJZEWU4G

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/AJZEWU4GHXPOM4SJ6XQKPKGIPW \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 02724b53863ddee67249f5e0a7a8c87db746194620e3ed5ca0b1765bc22ae073

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b6dea8d8ef3697de2ce82a489e9ba04fb48a4837af666ed105fe96f72094ec2b",
    "cross_cats_sorted": [
      "math.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AG",
    "submitted_at": "2026-05-31T15:00:20Z",
    "title_canon_sha256": "5af7c031190e1de809ac5e964ab013cbe8405c2f244cc7d5a322e1aaacdf23fe"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2606.01278",
    "kind": "arxiv",
    "version": 1
  }
}