Pith Number

pith:3HX46ERQ

pith:2009:3HX46ERQPNW3IE2USWHIU34SJV

not attested not anchored not stored refs pending

The SIR epidemic model from a PDE point of view

Fabio A. C. C. Chalub, Max O. Souza

arxiv:0912.3225 v1 · 2009-12-16 · 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{3HX46ERQPNW3IE2USWHIU34SJV}

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	2026-05-18T03:36:06.743660Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d9efcf12307b6db41354958e8a6f924d505e2b2ca39d0ea0edca3299bbb78c6f

Aliases

arxiv: 0912.3225 · arxiv_version: 0912.3225v1 · doi: 10.48550/arxiv.0912.3225 · pith_short_12: 3HX46ERQPNW3 · pith_short_16: 3HX46ERQPNW3IE2U · pith_short_8: 3HX46ERQ

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/3HX46ERQPNW3IE2USWHIU34SJV \
  | 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: d9efcf12307b6db41354958e8a6f924d505e2b2ca39d0ea0edca3299bbb78c6f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "15a20ba66723a5351c6ed17ef60ab546e5be73e82a3b433aad7129c9dacc3313",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "q-bio.PE",
    "submitted_at": "2009-12-16T18:55:29Z",
    "title_canon_sha256": "2250a35a272f292fb4643651c4bd9b794ca7379be49b81e40bd393149942b963"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0912.3225",
    "kind": "arxiv",
    "version": 1
  }
}