Pith Number

pith:NRCQUIGS

pith:2012:NRCQUIGS2SV73UDIRHKEZA4JRF

not attested not anchored not stored refs pending

MSOL Restricted Contractibility to Planar Graphs

James Abello, Jan Kratochv\'il, Pavel Klav\'ik, Tom\'a\v{s} Vysko\v{c}il

arxiv:1204.6070 v3 · 2012-04-26 · 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{NRCQUIGS2SV73UDIRHKEZA4JRF}

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	2026-05-18T00:45:01.981635Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6c450a20d2d4abfdd06889d44c8389894dac4777ee0e88632e21eef97cf18a96

Aliases

arxiv: 1204.6070 · arxiv_version: 1204.6070v3 · doi: 10.48550/arxiv.1204.6070 · pith_short_12: NRCQUIGS2SV7 · pith_short_16: NRCQUIGS2SV73UDI · pith_short_8: NRCQUIGS

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/NRCQUIGS2SV73UDIRHKEZA4JRF \
  | 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: 6c450a20d2d4abfdd06889d44c8389894dac4777ee0e88632e21eef97cf18a96

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5851383126f86c204433d23f9120c3e7ad667bb84d7101548418f10186586da6",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DS",
    "submitted_at": "2012-04-26T22:46:55Z",
    "title_canon_sha256": "62862b64dd459ae1e50b270d6d6b45717427d59486d5bc436e3ee92017f27ff0"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1204.6070",
    "kind": "arxiv",
    "version": 3
  }
}