Pith Number

pith:Y2JJ5YZG

pith:2011:Y2JJ5YZGJXHNJVFP6EJYD7RTT6

not attested not anchored not stored refs pending

A non-normal Fefferman-type construction of split-signature conformal structures admitting twistor spinors

Katja Sagerschnig, Matthias Hammerl

arxiv:1109.4231 v1 · 2011-09-20 · 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{Y2JJ5YZGJXHNJVFP6EJYD7RTT6}

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	2026-05-18T04:12:43.871550Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c6929ee3264dced4d4aff11381fe339f96420d1e764448e0b22cc3c6a5400f0a

Aliases

arxiv: 1109.4231 · arxiv_version: 1109.4231v1 · doi: 10.48550/arxiv.1109.4231 · pith_short_12: Y2JJ5YZGJXHN · pith_short_16: Y2JJ5YZGJXHNJVFP · pith_short_8: Y2JJ5YZG

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/Y2JJ5YZGJXHNJVFP6EJYD7RTT6 \
  | 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: c6929ee3264dced4d4aff11381fe339f96420d1e764448e0b22cc3c6a5400f0a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "97364c7d7bd207cc0e010f2b5779fd03fbe329af9f5b5393aae0c273f2c7cf0e",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.DG",
    "submitted_at": "2011-09-20T08:27:11Z",
    "title_canon_sha256": "eb5ed308eedee494a94e589bf7938cb55c3c1eec04c84c73ceddd164bebc490e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1109.4231",
    "kind": "arxiv",
    "version": 1
  }
}