Pith Number

pith:ACQN4XYX

pith:2021:ACQN4XYXMGZ4LNVKJGFJIIYMCB

not attested not anchored not stored refs pending

Poncelet-Darboux, Kippenhahn, and Szeg\H{o}: interactions between projective geometry, matrices and orthogonal polynomials

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

arxiv:2101.12165 v1 · 2021-01-28 · math.AG · math.CA · 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{ACQN4XYXMGZ4LNVKJGFJIIYMCB}

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	2026-07-05T02:10:34.824901Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

00a0de5f1761b3c5b6aa498a94230c107615e54ab13858bd4c09efac0cdfd4b2

Aliases

arxiv: 2101.12165 · arxiv_version: 2101.12165v1 · doi: 10.48550/arxiv.2101.12165 · pith_short_12: ACQN4XYXMGZ4 · pith_short_16: ACQN4XYXMGZ4LNVK · pith_short_8: ACQN4XYX

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/ACQN4XYXMGZ4LNVKJGFJIIYMCB \
  | 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: 00a0de5f1761b3c5b6aa498a94230c107615e54ab13858bd4c09efac0cdfd4b2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7d99c45379b4bab880612024728f9c296525232b61595060735e590f759d5305",
    "cross_cats_sorted": [
      "math.CA",
      "math.CV"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "math.AG",
    "submitted_at": "2021-01-28T18:20:29Z",
    "title_canon_sha256": "e583a921607467f2b0ea58c84d74eaf97d477fd778ccfb6b06bd587a3c8c59c2"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2101.12165",
    "kind": "arxiv",
    "version": 1
  }
}