Pith Number

pith:64W2CFYN

pith:2018:64W2CFYNFZOBTPQYGRK2MXJNFL

not attested not anchored not stored refs pending

Finite element simulation of fluid dynamics and CO$_2$ gas exchange in the alveolar sacs of the human lung

Luis J. Caucha, Obidio Rubio, Stefan Frei

arxiv:1804.02768 v1 · 2018-04-08 · math.NA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{64W2CFYNFZOBTPQYGRK2MXJNFL}

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	2026-05-18T00:18:58.454203Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f72da1170d2e5c19be183455a65d2d2ad5a8ce1eb73931f3c80c70b852512834

Aliases

arxiv: 1804.02768 · arxiv_version: 1804.02768v1 · doi: 10.48550/arxiv.1804.02768 · pith_short_12: 64W2CFYNFZOB · pith_short_16: 64W2CFYNFZOBTPQY · pith_short_8: 64W2CFYN

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/64W2CFYNFZOBTPQYGRK2MXJNFL \
  | 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: f72da1170d2e5c19be183455a65d2d2ad5a8ce1eb73931f3c80c70b852512834

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "8041050e85e7185f6dcf4f179680dca9b59f794d788d329a617860abb908bdb2",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2018-04-08T22:32:10Z",
    "title_canon_sha256": "f9f1cb4cea3fd3419105b1613b10de193b13cf581869d612798737087c9bb21a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1804.02768",
    "kind": "arxiv",
    "version": 1
  }
}