Pith Number

pith:OLPPEA7J

pith:2012:OLPPEA7J3C77MHOENIBK3E4YGA

not attested not anchored not stored refs pending

The Medusa of Spatial Sorting: 3D Kinetic Alpha Complexes and Implementation

Herbert Edelsbrunner, Michael Kerber

arxiv:1209.5434 v1 · 2012-09-24 · 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{OLPPEA7J3C77MHOENIBK3E4YGA}

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	2026-05-18T03:44:48.553109Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

72def203e9d8bff61dc46a02ad9398301be75f44de6f07b3f30892c87420a52c

Aliases

arxiv: 1209.5434 · arxiv_version: 1209.5434v1 · doi: 10.48550/arxiv.1209.5434 · pith_short_12: OLPPEA7J3C77 · pith_short_16: OLPPEA7J3C77MHOE · pith_short_8: OLPPEA7J

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/OLPPEA7J3C77MHOENIBK3E4YGA \
  | 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: 72def203e9d8bff61dc46a02ad9398301be75f44de6f07b3f30892c87420a52c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "432d4088fa30a8bafd382bf428a8b512490551ae991dd2c18b1194295112b417",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CG",
    "submitted_at": "2012-09-24T21:36:00Z",
    "title_canon_sha256": "2e06f0b70f791e630169e163051117084736bcf31e4e611b9c82868cfb32a59a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1209.5434",
    "kind": "arxiv",
    "version": 1
  }
}