Pith Number

pith:W7DSCMG6

pith:2017:W7DSCMG6TS3I3QJE5J6XV2AYST

not attested not anchored not stored refs pending

Approximate Convex Hulls: sketching the convex hull using curvature

Adam M. Oberman, Robert Graham

arxiv:1703.01350 v2 · 2017-02-27 · cs.CG · 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{W7DSCMG6TS3I3QJE5J6XV2AYST}

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	2026-05-18T00:42:19.684193Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b7c72130de9cb68dc124ea7d7ae81894e01c6f4d458061bc31965ab05dd3295a

Aliases

arxiv: 1703.01350 · arxiv_version: 1703.01350v2 · doi: 10.48550/arxiv.1703.01350 · pith_short_12: W7DSCMG6TS3I · pith_short_16: W7DSCMG6TS3I3QJE · pith_short_8: W7DSCMG6

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/W7DSCMG6TS3I3QJE5J6XV2AYST \
  | 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: b7c72130de9cb68dc124ea7d7ae81894e01c6f4d458061bc31965ab05dd3295a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "852b173c8b4dbcbbcb435d78a2e311e2db4d56eaed9d86a956d865be64e216c9",
    "cross_cats_sorted": [
      "math.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CG",
    "submitted_at": "2017-02-27T22:25:57Z",
    "title_canon_sha256": "0109be28b33ef922e1f0a375b6897ff5c0e827f8fda747f02d2f0944d12fd9d5"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1703.01350",
    "kind": "arxiv",
    "version": 2
  }
}