Pith Number

pith:EPT2PQKV

pith:2008:EPT2PQKVA7WGLER3FJ6GZYOHA4

not attested not anchored not stored refs pending

On NP complete problems I

Kunihiko Uehara, Minoru Fujimoto

arxiv:0809.0962 v1 · 2008-09-05 · math.GM

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{EPT2PQKVA7WGLER3FJ6GZYOHA4}

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	2026-05-18T03:37:42.262835Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

23e7a7c15507ec65923b2a7c6ce1c70728a1d6de8fe6b6415102ef99025ad0d0

Aliases

arxiv: 0809.0962 · arxiv_version: 0809.0962v1 · doi: 10.48550/arxiv.0809.0962 · pith_short_12: EPT2PQKVA7WG · pith_short_16: EPT2PQKVA7WGLER3 · pith_short_8: EPT2PQKV

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/EPT2PQKVA7WGLER3FJ6GZYOHA4 \
  | 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: 23e7a7c15507ec65923b2a7c6ce1c70728a1d6de8fe6b6415102ef99025ad0d0

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5140f96706250e42e1752681b42cb48655bd11a4f0c90ed7ca096ef53b089fe7",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.GM",
    "submitted_at": "2008-09-05T06:13:04Z",
    "title_canon_sha256": "bb4fb752d1a0dbb974e60cdb041c328355d4e7b69559ad52ca98eeaf121b4701"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0809.0962",
    "kind": "arxiv",
    "version": 1
  }
}