Pith Number

pith:W2D3JSRE

pith:2010:W2D3JSRE3FFAEMEPVAXBXIHBKQ

not attested not anchored not stored refs pending

The Sorting Buffer Problem is NP-hard

Ho-Leung Chan, Nicole Megow, Rene Sitters, Rob van Stee

arxiv:1009.4355 v1 · 2010-09-22 · cs.DS

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{W2D3JSRE3FFAEMEPVAXBXIHBKQ}

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	2026-05-18T04:40:33.285826Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b687b4ca24d94a02308fa82e1ba0e1542335a87ffd6b17cd2d13ecdfe4cdcaa8

Aliases

arxiv: 1009.4355 · arxiv_version: 1009.4355v1 · doi: 10.48550/arxiv.1009.4355 · pith_short_12: W2D3JSRE3FFA · pith_short_16: W2D3JSRE3FFAEMEP · pith_short_8: W2D3JSRE

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/W2D3JSRE3FFAEMEPVAXBXIHBKQ \
  | 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: b687b4ca24d94a02308fa82e1ba0e1542335a87ffd6b17cd2d13ecdfe4cdcaa8

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b483e20ad16121cbbd2d075e9c656eca2fbf3d48d9f8b69c6c6cee0461b02d95",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DS",
    "submitted_at": "2010-09-22T13:14:51Z",
    "title_canon_sha256": "c6f5c2e5cf7cb676d45d9bdc6a1fd245e33622dc18767f82bf294950db85fa7a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1009.4355",
    "kind": "arxiv",
    "version": 1
  }
}