Pith Number

pith:4ZMGRDFZ

pith:2020:4ZMGRDFZIRAOCLYKHWH2JX7PKM

not attested not anchored not stored refs pending

On List k-Coloring Convex Bipartite Graphs

Josep D\'iaz, Maria Serna, Oriol Serra, \"Oznur Ya\c{s}ar Diner

arxiv:2002.02729 v1 · 2020-02-07 · 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{4ZMGRDFZIRAOCLYKHWH2JX7PKM}

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	2026-07-05T00:38:58.392999Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e658688cb94440e12f0a3d8fa4dfef53082142fc8ca8b7dfb45478e2828f5076

Aliases

arxiv: 2002.02729 · arxiv_version: 2002.02729v1 · doi: 10.48550/arxiv.2002.02729 · pith_short_12: 4ZMGRDFZIRAO · pith_short_16: 4ZMGRDFZIRAOCLYK · pith_short_8: 4ZMGRDFZ

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/4ZMGRDFZIRAOCLYKHWH2JX7PKM \
  | 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: e658688cb94440e12f0a3d8fa4dfef53082142fc8ca8b7dfb45478e2828f5076

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e1f42387f7569be542f384226edf0fd964e3ffc16aaa5974504a532c9d3c170d",
    "cross_cats_sorted": [
      "cs.DM",
      "math.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CC",
    "submitted_at": "2020-02-07T12:06:41Z",
    "title_canon_sha256": "d78e8525e845d2f7b4d621dec7e880f70a3297fb50e6f033fd0586abea84306f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2002.02729",
    "kind": "arxiv",
    "version": 1
  }
}