Pith Number

pith:O7AANIIW

pith:2012:O7AANIIWTPKDSUE3WRG2UQHHIT

not attested not anchored not stored refs pending

Enumerating regular expressions and their languages

Hermann Gruber, Jeffrey Shallit, Jonathan Lee

arxiv:1204.4982 v1 · 2012-04-23 · cs.FL · math.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{O7AANIIWTPKDSUE3WRG2UQHHIT}

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	2026-05-18T03:57:15.024182Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

77c006a1169bd439509bb44daa40e744e34f4cc47a58378e9b48d22fec94b41f

Aliases

arxiv: 1204.4982 · arxiv_version: 1204.4982v1 · doi: 10.48550/arxiv.1204.4982 · pith_short_12: O7AANIIWTPKD · pith_short_16: O7AANIIWTPKDSUE3 · pith_short_8: O7AANIIW

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/O7AANIIWTPKDSUE3WRG2UQHHIT \
  | 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: 77c006a1169bd439509bb44daa40e744e34f4cc47a58378e9b48d22fec94b41f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9af804c56bc07fc51aab25fa7f8bd9ae8b139bf2737e13fd902fad99a2f42747",
    "cross_cats_sorted": [
      "math.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.FL",
    "submitted_at": "2012-04-23T07:29:22Z",
    "title_canon_sha256": "de29abf2bcbfb871e0f0aa2fe3701b812f390e919d19a026156735c3ad674d78"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1204.4982",
    "kind": "arxiv",
    "version": 1
  }
}