Pith Number

pith:223R4MMH

pith:2020:223R4MMHHBQOIIZ6TNONUE7EJO

not attested not anchored not stored refs pending

A fractional-order SEIHDR model for COVID-19 with inter-city networked coupling effects

Conghui Xu, Guojian Ren, Shuhui Wang, YangQuan Chen, Yongguang Yu, Zhenzhen Lu, Zhe Yin

arxiv:2004.12308 v3 · 2020-04-26 · physics.soc-ph · math.DS · q-bio.PE

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{223R4MMHHBQOIIZ6TNONUE7EJO}

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	2026-07-05T00:59:25.332394Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d6b71e31873860e4233e9b5cda13e44ba78eb4578c1e6b0d09af7eab832665be

Aliases

arxiv: 2004.12308 · arxiv_version: 2004.12308v3 · doi: 10.48550/arxiv.2004.12308 · pith_short_12: 223R4MMHHBQO · pith_short_16: 223R4MMHHBQOIIZ6 · pith_short_8: 223R4MMH

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/223R4MMHHBQOIIZ6TNONUE7EJO \
  | 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: d6b71e31873860e4233e9b5cda13e44ba78eb4578c1e6b0d09af7eab832665be

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3df070b33247ea78cc1fd4f3ac3e61cdeae4cc733f9bc47e2386a22e152c5913",
    "cross_cats_sorted": [
      "math.DS",
      "q-bio.PE"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "physics.soc-ph",
    "submitted_at": "2020-04-26T08:28:41Z",
    "title_canon_sha256": "a4864aa9c72fc09f27cb7b2846e9a43984f9f9afd720bf254ba3846f83e9075b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2004.12308",
    "kind": "arxiv",
    "version": 3
  }
}