Pith Number

pith:UNRKIZ3Q

pith:2018:UNRKIZ3QSZOXI7APPCAECTMADL

not attested not anchored not stored refs pending

The exact chromatic number of the convex segment disjointness graph

David R. Wood, Jakob Jonsson, Pavel Valtr, Ruy Fabila-Monroy

arxiv:1804.01057 v1 · 2018-04-03 · math.CO · cs.CG

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{UNRKIZ3QSZOXI7APPCAECTMADL}

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	2026-05-18T00:19:31.421017Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a362a46770965d747c0f7880414d801ad34adef959fa9bb1b63853c7782ae6cd

Aliases

arxiv: 1804.01057 · arxiv_version: 1804.01057v1 · doi: 10.48550/arxiv.1804.01057 · pith_short_12: UNRKIZ3QSZOX · pith_short_16: UNRKIZ3QSZOXI7AP · pith_short_8: UNRKIZ3Q

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/UNRKIZ3QSZOXI7APPCAECTMADL \
  | 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: a362a46770965d747c0f7880414d801ad34adef959fa9bb1b63853c7782ae6cd

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "62881695d7d46a7eff5b44f718f0eeb4da5bcbcfa9bfee5ec44e670817b47089",
    "cross_cats_sorted": [
      "cs.CG"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2018-04-03T16:28:02Z",
    "title_canon_sha256": "c0670750591b0e572f24669013342b35a5d958d8ac5534c13e11170be0825331"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1804.01057",
    "kind": "arxiv",
    "version": 1
  }
}