Pith Number

pith:F7ZCAC34

pith:2009:F7ZCAC346ICHYESX7CCX4H6CIM

not attested not anchored not stored refs pending

On the Internal Topological Structure of Plane Regions

Sanjiang Li

arxiv:0909.0109 v5 · 2009-09-01 · cs.AI · 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{F7ZCAC346ICHYESX7CCX4H6CIM}

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	2026-05-18T02:24:47.448748Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2ff2200b7cf2047c1257f8857e1fc243370f26f923f402b37129cf565f233612

Aliases

arxiv: 0909.0109 · arxiv_version: 0909.0109v5 · doi: 10.48550/arxiv.0909.0109 · pith_short_12: F7ZCAC346ICH · pith_short_16: F7ZCAC346ICHYESX · pith_short_8: F7ZCAC34

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/F7ZCAC346ICHYESX7CCX4H6CIM \
  | 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: 2ff2200b7cf2047c1257f8857e1fc243370f26f923f402b37129cf565f233612

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "405178628be5394a709d5ed1e75942b86ce8a093da5db8775b7366d1ad79a2be",
    "cross_cats_sorted": [
      "cs.CG"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.AI",
    "submitted_at": "2009-09-01T06:48:16Z",
    "title_canon_sha256": "4668a63943c7d387c4e496af1b12d4558b30c5edd99ea652e018864e81ab1b4a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0909.0109",
    "kind": "arxiv",
    "version": 5
  }
}