Pith Number

pith:4K74UN5A

pith:2013:4K74UN5AHVWF4D2YKYGVCCTZJB

not attested not anchored not stored refs pending

The guillotine approach for TSP with neighborhoods revisited

Sophie Spirkl

arxiv:1312.0378 v2 · 2013-12-02 · cs.CG

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{4K74UN5AHVWF4D2YKYGVCCTZJB}

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	2026-05-18T02:54:46.698681Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e2bfca37a03d6c5e0f58560d510a794840cc963da7d5ebdd7c6e13fc6f079471

Aliases

arxiv: 1312.0378 · arxiv_version: 1312.0378v2 · doi: 10.48550/arxiv.1312.0378 · pith_short_12: 4K74UN5AHVWF · pith_short_16: 4K74UN5AHVWF4D2Y · pith_short_8: 4K74UN5A

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/4K74UN5AHVWF4D2YKYGVCCTZJB \
  | 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: e2bfca37a03d6c5e0f58560d510a794840cc963da7d5ebdd7c6e13fc6f079471

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "03ea68628c538dc0b0cb2c9e113a6f66f7ba110557029a1553cf71e5a91c9b4b",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CG",
    "submitted_at": "2013-12-02T09:06:32Z",
    "title_canon_sha256": "d6de4d507be5e433ef553a560ed502ef94ef2df4ec45e3318ac285fe48eb600b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1312.0378",
    "kind": "arxiv",
    "version": 2
  }
}