Pith Number

pith:H3TPWVVI

pith:2021:H3TPWVVI3M5IGWG6IDRDQ6YVLI

not attested not anchored not stored refs pending

On foci of ellipses inscribed in cyclic polygons

Andrei Martinez-Finkelshtein, Brian Simanek, Markus Hunziker, Taylor Poe

arxiv:2101.12638 v1 · 2021-01-29 · math.CA · math.AG · math.CV

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{H3TPWVVI3M5IGWG6IDRDQ6YVLI}

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	2026-07-05T02:10:46.158257Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3ee6fb56a8db3a8358de40e2387b155a03c0e0cef8b8cef36c7ae99e394d0545

Aliases

arxiv: 2101.12638 · arxiv_version: 2101.12638v1 · doi: 10.48550/arxiv.2101.12638 · pith_short_12: H3TPWVVI3M5I · pith_short_16: H3TPWVVI3M5IGWG6 · pith_short_8: H3TPWVVI

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/H3TPWVVI3M5IGWG6IDRDQ6YVLI \
  | 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: 3ee6fb56a8db3a8358de40e2387b155a03c0e0cef8b8cef36c7ae99e394d0545

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9692773178fc4665cc33aaa10833d9b7f991afde92ec1889aac3180e5b62124c",
    "cross_cats_sorted": [
      "math.AG",
      "math.CV"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "math.CA",
    "submitted_at": "2021-01-29T15:19:02Z",
    "title_canon_sha256": "9ff23c9c86aa9effbeaacb999fed485e748e833702314736915af17d2128f5bf"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2101.12638",
    "kind": "arxiv",
    "version": 1
  }
}