Pith Number

pith:GH7CMZMX

pith:2017:GH7CMZMXVLJIO6KYM2AA6IWML7

not attested not anchored not stored refs pending

Contraction and Deletion Blockers for Perfect Graphs and $H$-free Graphs

Bernard Ries, Christophe Picouleau, Dani\"el Paulusma, \"Oznur Ya\c{s}ar Diner

arxiv:1706.09052 v1 · 2017-06-27 · cs.DS · cs.CC · cs.DM · 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{GH7CMZMXVLJIO6KYM2AA6IWML7}

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	2026-05-18T00:41:20.033210Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

31fe266597aad287795866800f22cc5fd10a5c68edc8c44683007bd457ecc200

Aliases

arxiv: 1706.09052 · arxiv_version: 1706.09052v1 · doi: 10.48550/arxiv.1706.09052 · pith_short_12: GH7CMZMXVLJI · pith_short_16: GH7CMZMXVLJIO6KY · pith_short_8: GH7CMZMX

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/GH7CMZMXVLJIO6KYM2AA6IWML7 \
  | 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: 31fe266597aad287795866800f22cc5fd10a5c68edc8c44683007bd457ecc200

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "51033d7b07551ab43b2621601141ac894f97451a852c54f1d3836f73af958c9e",
    "cross_cats_sorted": [
      "cs.CC",
      "cs.DM",
      "math.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DS",
    "submitted_at": "2017-06-27T21:16:25Z",
    "title_canon_sha256": "1f735406f11cef91d6f11b8247199e93c2c56fb7ec3bb342b7f85e07c5130487"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1706.09052",
    "kind": "arxiv",
    "version": 1
  }
}