Pith Number

pith:TVT7XJ5F

pith:2012:TVT7XJ5FRUCKIF42QEA2SP4JO7

not attested not anchored not stored refs pending

AD in Fortran, Part 2: Implementation via Prepreprocessor

Alexey Radul, Barak A. Pearlmutter, Jeffrey Mark Siskind

arxiv:1203.1450 v2 · 2012-03-07 · cs.PL · cs.MS · cs.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{TVT7XJ5FRUCKIF42QEA2SP4JO7}

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	2026-05-18T01:21:14.200234Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

9d67fba7a58d04a4179a8101a93f8977d5f402369a41ff952d56568d5720552f

Aliases

arxiv: 1203.1450 · arxiv_version: 1203.1450v2 · doi: 10.48550/arxiv.1203.1450 · pith_short_12: TVT7XJ5FRUCK · pith_short_16: TVT7XJ5FRUCKIF42 · pith_short_8: TVT7XJ5F

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/TVT7XJ5FRUCKIF42QEA2SP4JO7 \
  | 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: 9d67fba7a58d04a4179a8101a93f8977d5f402369a41ff952d56568d5720552f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "015da375c0b39237842b11b511df4f25d21a5d46f340432dfc4b0fb857923e47",
    "cross_cats_sorted": [
      "cs.MS",
      "cs.NA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.PL",
    "submitted_at": "2012-03-07T12:16:30Z",
    "title_canon_sha256": "831bd24a834ceb3ad29946e2ac91529ea34f8402d7b3f974bbdb23c1f20eb24b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1203.1450",
    "kind": "arxiv",
    "version": 2
  }
}