Pith Number

pith:H6BYO3D2

pith:2019:H6BYO3D2TY4BUM7MYYVZ2LOH2X

not attested not anchored not stored refs pending

Obstructions for partitioning into forests and outerplanar graphs

Ringi Kim, Sang-il Oum, Sergey Norin

arxiv:1903.08425 v3 · 2019-03-20 · 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{H6BYO3D2TY4BUM7MYYVZ2LOH2X}

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	2026-07-05T01:49:00.247042Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3f83876c7a9e381a33ecc62b9d2dc7d5eff037ed2b3e7cf6c397f7014b520ee1

Aliases

arxiv: 1903.08425 · arxiv_version: 1903.08425v3 · doi: 10.48550/arxiv.1903.08425 · pith_short_12: H6BYO3D2TY4B · pith_short_16: H6BYO3D2TY4BUM7M · pith_short_8: H6BYO3D2

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/H6BYO3D2TY4BUM7MYYVZ2LOH2X \
  | 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: 3f83876c7a9e381a33ecc62b9d2dc7d5eff037ed2b3e7cf6c397f7014b520ee1

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "58314e6f34304597c8a6dd717d494921db4307632aceb2e39a607d6f9a7549c7",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2019-03-20T10:27:30Z",
    "title_canon_sha256": "15654f407c9ddc9366421d7c0b88f59cf09953a3d3d2b1a54ea28af5c93f999c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1903.08425",
    "kind": "arxiv",
    "version": 3
  }
}