Pith Number

pith:EG4WKS72

pith:2018:EG4WKS72ENDIAS5RWCV6NMAVBU

not attested not anchored not stored refs pending

Optimal Regular Expressions for Permutations

Antonio Molina Lovett, Jeffrey Shallit

arxiv:1812.06347 v1 · 2018-12-15 · cs.FL

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{EG4WKS72ENDIAS5RWCV6NMAVBU}

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	2026-05-17T23:58:10.496951Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

21b9654bfa2346804bb1b0abe6b0150d08d24e30b172bea1e64d4aebdac1e31e

Aliases

arxiv: 1812.06347 · arxiv_version: 1812.06347v1 · doi: 10.48550/arxiv.1812.06347 · pith_short_12: EG4WKS72ENDI · pith_short_16: EG4WKS72ENDIAS5R · pith_short_8: EG4WKS72

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/EG4WKS72ENDIAS5RWCV6NMAVBU \
  | 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: 21b9654bfa2346804bb1b0abe6b0150d08d24e30b172bea1e64d4aebdac1e31e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "388dc42dd812e8d91460315c9d200c30267b62dca92bf8b07a2320b1090f25b9",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.FL",
    "submitted_at": "2018-12-15T20:22:31Z",
    "title_canon_sha256": "980cd7dfc872793ac9cd9763a2b2ac071bea724dead8d4c7de474f44fde7ddff"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1812.06347",
    "kind": "arxiv",
    "version": 1
  }
}