Pith Number

pith:SA5UMADI

pith:2017:SA5UMADIBSV5JQYSEXDMNHK45B

not attested not anchored not stored refs pending

Minimal obstructions to $2$-polar cographs

C\'esar Hern\'andez-Cruz, Cl\'audia Linhares Sales, Pavol Hell

arxiv:1703.03500 v1 · 2017-03-10 · 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{SA5UMADIBSV5JQYSEXDMNHK45B}

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	2026-05-18T00:48:58.942073Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

903b4600680cabd4c31225c6c69d5ce861270e1d5ddfb8a952bba80882509dd3

Aliases

arxiv: 1703.03500 · arxiv_version: 1703.03500v1 · doi: 10.48550/arxiv.1703.03500 · pith_short_12: SA5UMADIBSV5 · pith_short_16: SA5UMADIBSV5JQYS · pith_short_8: SA5UMADI

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/SA5UMADIBSV5JQYSEXDMNHK45B \
  | 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: 903b4600680cabd4c31225c6c69d5ce861270e1d5ddfb8a952bba80882509dd3

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "412c990790c9d4ad368862b04bfdabb8a38c3a6fd6c37ccb5814c8640e73c041",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2017-03-10T01:06:08Z",
    "title_canon_sha256": "a6b439555af9449c48d674b58cd917533662e2efd1af843a81a31a7f79bc87c0"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1703.03500",
    "kind": "arxiv",
    "version": 1
  }
}