Pith Number

pith:SFDZH3NV

pith:2017:SFDZH3NV2NZWKM6ZUA4EOLUP2U

not attested not anchored not stored refs pending

3-coloring triangle-free planar graphs with a precolored 9-cycle

Bernard Lidick\'y, Ilkyoo Choi, Jan Ekstein, P\v{r}emysl Holub

arxiv:1709.09428 v1 · 2017-09-27 · 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{SFDZH3NV2NZWKM6ZUA4EOLUP2U}

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	2026-05-18T00:34:11.789219Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

914793edb5d3736533d9a038472e8fd50a2d8e60115b514868fa448f83985d6e

Aliases

arxiv: 1709.09428 · arxiv_version: 1709.09428v1 · doi: 10.48550/arxiv.1709.09428 · pith_short_12: SFDZH3NV2NZW · pith_short_16: SFDZH3NV2NZWKM6Z · pith_short_8: SFDZH3NV

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/SFDZH3NV2NZWKM6ZUA4EOLUP2U \
  | 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: 914793edb5d3736533d9a038472e8fd50a2d8e60115b514868fa448f83985d6e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "084870f512adf27b89ec2810aed3598e1cd72aaa90c0aa102cfdeccd3f796094",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2017-09-27T10:06:54Z",
    "title_canon_sha256": "f7093e682d4bee747bf0c4f6fdb15a64ca7cabeef915f0a06f37204cb925bffe"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1709.09428",
    "kind": "arxiv",
    "version": 1
  }
}