Pith Number

pith:OHYWFRTF

pith:2007:OHYWFRTFXIYIUC6KASCGSITU5T

not attested not anchored not stored refs pending

On a Clique-Based Integer Programming Formulation of Vertex Colouring with Applications in Course Timetabling

Andrew J. Parkes, Edmund K. Burke, Hana Rudova, Jakub Marecek

arxiv:0710.3603 v3 · 2007-10-18 · cs.DM · cs.DS · 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{OHYWFRTFXIYIUC6KASCGSITU5T}

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	2026-05-18T02:54:38.150575Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

71f162c665ba308a0bca0484692274ece4530c749f65ef59ca561191d3b29ce6

Aliases

arxiv: 0710.3603 · arxiv_version: 0710.3603v3 · doi: 10.48550/arxiv.0710.3603 · pith_short_12: OHYWFRTFXIYI · pith_short_16: OHYWFRTFXIYIUC6K · pith_short_8: OHYWFRTF

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/OHYWFRTFXIYIUC6KASCGSITU5T \
  | 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: 71f162c665ba308a0bca0484692274ece4530c749f65ef59ca561191d3b29ce6

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d634c028889c510aa25da1f0354da3ce95b0eb1688653a43591e60c08b8063ff",
    "cross_cats_sorted": [
      "cs.DS",
      "math.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DM",
    "submitted_at": "2007-10-18T21:38:37Z",
    "title_canon_sha256": "be2872560c13c4c2605462c86e09a88668e8930bd48e7082595e1853aab840ff"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0710.3603",
    "kind": "arxiv",
    "version": 3
  }
}