Pith Number

pith:PKQOUOUO

pith:2018:PKQOUOUOCQDTZRRDDEF7ARM7CB

not attested not anchored not stored refs pending

A counterexample to Las Vergnas' strong map conjecture on realizable oriented matroids

Pei Wu

arxiv:1803.06825 v2 · 2018-03-19 · 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{PKQOUOUOCQDTZRRDDEF7ARM7CB}

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	2026-05-17T23:48:06.752031Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7aa0ea3a8e14073cc623190bf0459f10710df2b9606a7634698445fd46b90398

Aliases

arxiv: 1803.06825 · arxiv_version: 1803.06825v2 · doi: 10.48550/arxiv.1803.06825 · pith_short_12: PKQOUOUOCQDT · pith_short_16: PKQOUOUOCQDTZRRD · pith_short_8: PKQOUOUO

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/PKQOUOUOCQDTZRRDDEF7ARM7CB \
  | 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: 7aa0ea3a8e14073cc623190bf0459f10710df2b9606a7634698445fd46b90398

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7a28815ff73f114b0bee813a0f2e8849d92779b7e64e2a5c6b60f2a3354cfbd3",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2018-03-19T07:55:41Z",
    "title_canon_sha256": "29c286b1bc3544107d43a34cac0d1a49cedd2794c3ad9b30dd2d598fde114417"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1803.06825",
    "kind": "arxiv",
    "version": 2
  }
}