Pith Number

pith:NWI56XKR

pith:2017:NWI56XKROR4U2P43XMR27V33LU

not attested not anchored not stored refs pending

A necessary condition for strong hyperbolicity of general first order systems

Fernando Abalos

arxiv:1707.05011 v1 · 2017-07-17 · 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{NWI56XKROR4U2P43XMR27V33LU}

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	2026-07-05T03:31:50.546858Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6d91df5d5174794d3f9bbb23afd77b5d1c087a3ad6211181d9a82b5548f64a5c

Aliases

arxiv: 1707.05011 · arxiv_version: 1707.05011v1 · doi: 10.48550/arxiv.1707.05011 · pith_short_12: NWI56XKROR4U · pith_short_16: NWI56XKROR4U2P43 · pith_short_8: NWI56XKR

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/NWI56XKROR4U2P43XMR27V33LU \
  | 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: 6d91df5d5174794d3f9bbb23afd77b5d1c087a3ad6211181d9a82b5548f64a5c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e48a090f0c5527a5397033975e892bc07fd9821bdf3d39631a6a9c2fd71cc4d1",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "gr-qc",
    "submitted_at": "2017-07-17T06:36:19Z",
    "title_canon_sha256": "32be9cf8c217409ba3d174f26b0525654df9f7bb34fb68ebd75ed22e05ae681a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1707.05011",
    "kind": "arxiv",
    "version": 1
  }
}