Pith Number

pith:Y7JSCDBC

pith:2015:Y7JSCDBCMHWYOKPFJDICIWNZO6

not attested not anchored not stored refs pending

On the Threshold of Intractability

Blair D. Sullivan, Daniel Lokshtanov, Markus Sortland Dregi, P{\aa}l Gr{\o}n{\aa}s Drange

arxiv:1505.00612 v1 · 2015-05-04 · cs.DS · cs.CC · cs.SI

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{Y7JSCDBCMHWYOKPFJDICIWNZO6}

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	2026-05-18T02:17:02.385733Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c7d3210c2261ed8729e548d02459b977b1f251e62a81613da866d6a7ce18bdd1

Aliases

arxiv: 1505.00612 · arxiv_version: 1505.00612v1 · doi: 10.48550/arxiv.1505.00612 · pith_short_12: Y7JSCDBCMHWY · pith_short_16: Y7JSCDBCMHWYOKPF · pith_short_8: Y7JSCDBC

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/Y7JSCDBCMHWYOKPFJDICIWNZO6 \
  | 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: c7d3210c2261ed8729e548d02459b977b1f251e62a81613da866d6a7ce18bdd1

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d2e530ea0e0e9db860478ed12c346e518301098a02fa9b761fe17795507e33a9",
    "cross_cats_sorted": [
      "cs.CC",
      "cs.SI"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DS",
    "submitted_at": "2015-05-04T12:46:20Z",
    "title_canon_sha256": "1d1793d2226fb4a8f84036bfa0f45accc916854d41b2ff16c5ad3a261ef26eb8"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1505.00612",
    "kind": "arxiv",
    "version": 1
  }
}