Pith Number

pith:4JBL6RNQ

pith:2017:4JBL6RNQNXFHJ65TWVRAE4YWG6

not attested not anchored not stored refs pending

On Two Unsolved Problems Concerning Matching Covered Graphs

Cl\'audio L. Lucchesi, Marcelo H. de Carvalho, Nishad Kothari, U. S. R. Murty

arxiv:1705.09428 v1 · 2017-05-26 · math.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{4JBL6RNQNXFHJ65TWVRAE4YWG6}

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	2026-05-18T00:43:38.753495Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e242bf45b06dca74fbb3b56202731637b2bca06d380861557f67ab8bedc237da

Aliases

arxiv: 1705.09428 · arxiv_version: 1705.09428v1 · doi: 10.48550/arxiv.1705.09428 · pith_short_12: 4JBL6RNQNXFH · pith_short_16: 4JBL6RNQNXFHJ65T · pith_short_8: 4JBL6RNQ

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/4JBL6RNQNXFHJ65TWVRAE4YWG6 \
  | 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: e242bf45b06dca74fbb3b56202731637b2bca06d380861557f67ab8bedc237da

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "857dae435d3dc13b87487712b1a654c9c0008faaebdf2b0650f1132c8ef92531",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2017-05-26T04:22:52Z",
    "title_canon_sha256": "744f43d987f53bbcd95b25c5fe94630aa4fca286073bf8a002663cc8a8f92623"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1705.09428",
    "kind": "arxiv",
    "version": 1
  }
}