Pith Number

pith:QZPVK7PQ

pith:2012:QZPVK7PQOTJJWDRN2NMI7QQQJ3

not attested not anchored not stored refs pending

A Greedy Double Swap Heuristic for Nurse Scheduling

Michelle Cheong, Murphy Choy

arxiv:1205.2200 v1 · 2012-05-10 · cs.OH

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{QZPVK7PQOTJJWDRN2NMI7QQQJ3}

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	2026-05-18T03:53:31.304586Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

865f557df074d29b0e2dd3588fc2104ecbae01ebafa03d6f1541ad397f7d0750

Aliases

arxiv: 1205.2200 · arxiv_version: 1205.2200v1 · doi: 10.48550/arxiv.1205.2200 · pith_short_12: QZPVK7PQOTJJ · pith_short_16: QZPVK7PQOTJJWDRN · pith_short_8: QZPVK7PQ

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/QZPVK7PQOTJJWDRN2NMI7QQQJ3 \
  | 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: 865f557df074d29b0e2dd3588fc2104ecbae01ebafa03d6f1541ad397f7d0750

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3fc99c0ecd4f0d9421987d5dfefd9092240c53f5f4787e2169ed5f9aaed4e110",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.OH",
    "submitted_at": "2012-05-10T08:54:57Z",
    "title_canon_sha256": "2f154a53f90d073102c7ed391d717baf832ba299bfc01d37753a48bd852dba10"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1205.2200",
    "kind": "arxiv",
    "version": 1
  }
}