Pith Number

pith:NORQJ6M4

pith:2013:NORQJ6M4OCSZKUBHHFMRLI3BGB

not attested not anchored not stored refs pending

Towards a Classification of pseudo-Riemannian Geometries Admitting Twistor Spinors

Andree Lischewski

arxiv:1303.7246 v2 · 2013-03-28 · math.DG

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{NORQJ6M4OCSZKUBHHFMRLI3BGB}

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	2026-05-18T02:45:32.100338Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6ba304f99c70a5955027395915a361304eefdf0416068860561f69cc4bb731d7

Aliases

arxiv: 1303.7246 · arxiv_version: 1303.7246v2 · doi: 10.48550/arxiv.1303.7246 · pith_short_12: NORQJ6M4OCSZ · pith_short_16: NORQJ6M4OCSZKUBH · pith_short_8: NORQJ6M4

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/NORQJ6M4OCSZKUBHHFMRLI3BGB \
  | 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: 6ba304f99c70a5955027395915a361304eefdf0416068860561f69cc4bb731d7

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9e39cdd39878775c327ab8a3e9e1391610d8bcd982ca6977e06908a87ae9517e",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.DG",
    "submitted_at": "2013-03-28T20:24:52Z",
    "title_canon_sha256": "8a211f5c987b7083c0a8e546e85db0164f0cdfb4a1854c4a6c9ed315b203df76"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1303.7246",
    "kind": "arxiv",
    "version": 2
  }
}