Pith Number

pith:5UBCVEGO

pith:2011:5UBCVEGONISOZK6PSWLX4HR2K2

not attested not anchored not stored refs pending

Acyclic and Star Colorings of Cographs

Andrew Lyons

arxiv:1103.5531 v1 · 2011-03-29 · cs.DS · cs.DM · 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{5UBCVEGONISOZK6PSWLX4HR2K2}

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	2026-05-18T04:25:37.391639Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ed022a90ce6a24ecabcf95977e1e3a56ab444f9051ae914fc938b2114467a0d0

Aliases

arxiv: 1103.5531 · arxiv_version: 1103.5531v1 · doi: 10.48550/arxiv.1103.5531 · pith_short_12: 5UBCVEGONISO · pith_short_16: 5UBCVEGONISOZK6P · pith_short_8: 5UBCVEGO

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/5UBCVEGONISOZK6PSWLX4HR2K2 \
  | 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: ed022a90ce6a24ecabcf95977e1e3a56ab444f9051ae914fc938b2114467a0d0

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a3f2a8642148dac216344f1ac61d0ec4d202550cfbcb3074972d3ef9362c9f1b",
    "cross_cats_sorted": [
      "cs.DM",
      "math.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DS",
    "submitted_at": "2011-03-29T02:25:49Z",
    "title_canon_sha256": "2eba03d34e7d30d717c5a0d7ce625d9c136ea85babea0d89fb1516125f2df73f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1103.5531",
    "kind": "arxiv",
    "version": 1
  }
}