Pith Number

pith:EZ6PQTGU

pith:2011:EZ6PQTGUWPI6OLIUYWQ4X5WOY5

not attested not anchored not stored refs pending

Elementary Components of the Quadratic Assignment Problem

Enrique Alba, Francisco Chicano, Gabriel Luque

arxiv:1109.4875 v1 · 2011-09-22 · cs.DM

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{EZ6PQTGUWPI6OLIUYWQ4X5WOY5}

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	2026-05-18T04:10:11.837407Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

267cf84cd4b3d1e72d14c5a1cbf6cec77f1bee659163ee64319de2ec2bbec665

Aliases

arxiv: 1109.4875 · arxiv_version: 1109.4875v1 · doi: 10.48550/arxiv.1109.4875 · pith_short_12: EZ6PQTGUWPI6 · pith_short_16: EZ6PQTGUWPI6OLIU · pith_short_8: EZ6PQTGU

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/EZ6PQTGUWPI6OLIUYWQ4X5WOY5 \
  | 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: 267cf84cd4b3d1e72d14c5a1cbf6cec77f1bee659163ee64319de2ec2bbec665

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "75cf5e8bd3348b8533ba2178b3003fcc0e344a5501f83c94e89524e061972fbc",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DM",
    "submitted_at": "2011-09-22T16:31:42Z",
    "title_canon_sha256": "3fed7056bcf5a2da16b7710f05dbf3dc1f499a9dc3eb3298584032ea8e38e26a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1109.4875",
    "kind": "arxiv",
    "version": 1
  }
}