Pith Number

pith:4QBDOJKL

pith:2012:4QBDOJKL3K2J2FTVTEUY2HOYUA

not attested not anchored not stored refs pending

An Algorithm for Finding Convex Hulls of Planar Point Sets

Gang Mei, John C.Tipper, Nengxiong Xu

arxiv:1212.6043 v1 · 2012-12-25 · 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{4QBDOJKL3K2J2FTVTEUY2HOYUA}

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	2026-05-18T03:14:39.264861Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e40237254bdab49d167599298d1dd8a028de1d8f1fdbf0ce0a3a5f5892e87524

Aliases

arxiv: 1212.6043 · arxiv_version: 1212.6043v1 · doi: 10.48550/arxiv.1212.6043 · pith_short_12: 4QBDOJKL3K2J · pith_short_16: 4QBDOJKL3K2J2FTV · pith_short_8: 4QBDOJKL

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/4QBDOJKL3K2J2FTVTEUY2HOYUA \
  | 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: e40237254bdab49d167599298d1dd8a028de1d8f1fdbf0ce0a3a5f5892e87524

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b7b44964d70d690f2dce96578d17f8a513035ac54bba1abf65607911dc4a064b",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CG",
    "submitted_at": "2012-12-25T13:08:26Z",
    "title_canon_sha256": "406dd4cfc1edc0e0c4b028953d5e4486f5a3931b0a10f66cf5e4e445cba79ea7"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1212.6043",
    "kind": "arxiv",
    "version": 1
  }
}