Pith Number

pith:Q2RDEFM4

pith:2009:Q2RDEFM4ZGCNPB72CL7JCSVDOT

not attested not anchored not stored refs pending

A new method to compute quasi-local spin and other invariants on marginally trapped surfaces

Michael Jasiulek

arxiv:0906.1228 v2 · 2009-06-08 · gr-qc

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{Q2RDEFM4ZGCNPB72CL7JCSVDOT}

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	2026-05-18T02:34:45.891986Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

86a232159cc984d787fa12fe914aa374c7cd6e1c40fc2d83a3522bd385424266

Aliases

arxiv: 0906.1228 · arxiv_version: 0906.1228v2 · doi: 10.48550/arxiv.0906.1228 · pith_short_12: Q2RDEFM4ZGCN · pith_short_16: Q2RDEFM4ZGCNPB72 · pith_short_8: Q2RDEFM4

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/Q2RDEFM4ZGCNPB72CL7JCSVDOT \
  | 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: 86a232159cc984d787fa12fe914aa374c7cd6e1c40fc2d83a3522bd385424266

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "21f8a58514b4ce9f46248c5dd833fdf6fd413dbca7da9e658c575d10ff25796e",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "gr-qc",
    "submitted_at": "2009-06-08T15:24:13Z",
    "title_canon_sha256": "83f4b4808d71d0f6038d4aa01c45af9cca424a59d755965e2934b82b9890e98a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0906.1228",
    "kind": "arxiv",
    "version": 2
  }
}