Pith Number

pith:U6DFNSEW

pith:2004:U6DFNSEWUQN2DW6ZO2IHNV345H

not attested not anchored not stored refs pending

A model problem for the initial-boundary value formulation of Einstein's field equations

Olivier Sarbach, Oscar Reula

arxiv:gr-qc/0409027 v1 · 2004-09-06 · 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{U6DFNSEWUQN2DW6ZO2IHNV345H}

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	2026-05-18T04:41:25.596681Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a78656c896a41ba1dbd9769076d77ce9f26d4cdc5898b65187ed1d5551a68f9c

Aliases

arxiv: gr-qc/0409027 · arxiv_version: gr-qc/0409027v1 · doi: 10.48550/arxiv.gr-qc/0409027 · pith_short_12: U6DFNSEWUQN2 · pith_short_16: U6DFNSEWUQN2DW6Z · pith_short_8: U6DFNSEW

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/U6DFNSEWUQN2DW6ZO2IHNV345H \
  | 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: a78656c896a41ba1dbd9769076d77ce9f26d4cdc5898b65187ed1d5551a68f9c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f668cb80f7ebf1bc5a28f6567eeed9f6a61e095fb96308d633ecca90e9a3394e",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "gr-qc",
    "submitted_at": "2004-09-06T21:33:53Z",
    "title_canon_sha256": "d7ce1b1875c6eaadb3a144dd5f754c26c86f6a192cadc33f37dd43db9c1c1853"
  },
  "schema_version": "1.0",
  "source": {
    "id": "gr-qc/0409027",
    "kind": "arxiv",
    "version": 1
  }
}