Pith Number

pith:7RJAEOMF

pith:2012:7RJAEOMFUYEV3CEDDGLAOU5WKN

not attested not anchored not stored refs pending

Recognition of collapsible complexes is NP-complete

Martin Tancer

arxiv:1211.6254 v2 · 2012-11-27 · 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{7RJAEOMFUYEV3CEDDGLAOU5WKN}

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	2026-05-18T01:30:55.738911Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

fc52023985a6095d888319960753b6534e1f81a31ffc72cdf3f31f0870dae6ad

Aliases

arxiv: 1211.6254 · arxiv_version: 1211.6254v2 · doi: 10.48550/arxiv.1211.6254 · pith_short_12: 7RJAEOMFUYEV · pith_short_16: 7RJAEOMFUYEV3CED · pith_short_8: 7RJAEOMF

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/7RJAEOMFUYEV3CEDDGLAOU5WKN \
  | 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: fc52023985a6095d888319960753b6534e1f81a31ffc72cdf3f31f0870dae6ad

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9ea40d3a2a8b70a986524788745a479bf0f6e8a61001b4a3677becdb3370a36f",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CG",
    "submitted_at": "2012-11-27T09:59:25Z",
    "title_canon_sha256": "90a4bf5e892276c87f06c26e6c8a0778970c1b49fb0d956a0aa6b602aa6db305"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1211.6254",
    "kind": "arxiv",
    "version": 2
  }
}