Pith Number

pith:HUIH25V4

pith:2009:HUIH25V4B4GOAOR4VLJPNZIZKH

not attested not anchored not stored refs pending

Decomposition, Reformulation, and Diving in University Course Timetabling

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

arxiv:0903.1095 v2 · 2009-03-05 · cs.DS · cs.AI

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{HUIH25V4B4GOAOR4VLJPNZIZKH}

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	2026-05-18T02:54:38.132500Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3d107d76bc0f0ce03a3caad2f6e51951c9782cdb79e5629e69517d8dec6520a2

Aliases

arxiv: 0903.1095 · arxiv_version: 0903.1095v2 · doi: 10.48550/arxiv.0903.1095 · pith_short_12: HUIH25V4B4GO · pith_short_16: HUIH25V4B4GOAOR4 · pith_short_8: HUIH25V4

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/HUIH25V4B4GOAOR4VLJPNZIZKH \
  | 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: 3d107d76bc0f0ce03a3caad2f6e51951c9782cdb79e5629e69517d8dec6520a2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "88bb7449803577987f7a434865ca85244278f60a28a21939cf1ee8c7b957dfd4",
    "cross_cats_sorted": [
      "cs.AI"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DS",
    "submitted_at": "2009-03-05T20:40:32Z",
    "title_canon_sha256": "e77d9bf4e37baed58aa0ea130061d82dee4457ce9e9f3c7e6395ba64b96f8424"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0903.1095",
    "kind": "arxiv",
    "version": 2
  }
}