Pith Number

pith:35IMSN2S

pith:2017:35IMSN2SIFZLFG6E5WNE5OTUKZ

not attested not anchored not stored refs pending

Shear and vorticity of perfect-fluid spacetimes and the shear-free conjecture

Carlo Alberto Mantica, Luca Guido Molinari

arxiv:1709.03547 v2 · 2017-09-11 · gr-qc · math-ph · math.DG · math.MP

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{35IMSN2SIFZLFG6E5WNE5OTUKZ}

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	2026-05-18T00:30:16.411442Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

df50c937524172b29bc4ed9a4eba745656d9e0687db9a19301aa5999a76393f5

Aliases

arxiv: 1709.03547 · arxiv_version: 1709.03547v2 · doi: 10.48550/arxiv.1709.03547 · pith_short_12: 35IMSN2SIFZL · pith_short_16: 35IMSN2SIFZLFG6E · pith_short_8: 35IMSN2S

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/35IMSN2SIFZLFG6E5WNE5OTUKZ \
  | 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: df50c937524172b29bc4ed9a4eba745656d9e0687db9a19301aa5999a76393f5

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "db4685f491a3a4d0f54401a9e47e7afcd0278ea8ad4a1f6e618a668b89f60412",
    "cross_cats_sorted": [
      "math-ph",
      "math.DG",
      "math.MP"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "gr-qc",
    "submitted_at": "2017-09-11T19:04:22Z",
    "title_canon_sha256": "cdb8e960e9578dac1977391d5fe529a32931622e40b1638900d308b0f79ca2b2"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1709.03547",
    "kind": "arxiv",
    "version": 2
  }
}