Pith Number

pith:7YSCNJDF

pith:2010:7YSCNJDFKIB6YWCZHU2U4TMAJU

not attested not anchored not stored refs pending

The Magic Number Problem for Subregular Language Families

Markus Holzer, Martin Kutrib, Sebastian Jakobi

arxiv:1008.1653 v1 · 2010-08-10 · cs.FL · cs.IT · math.IT

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{7YSCNJDFKIB6YWCZHU2U4TMAJU}

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	2026-05-18T04:42:23.611583Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

fe2426a4655203ec58593d354e4d804d0b61ac6c39ab22aa18b10eab453342a1

Aliases

arxiv: 1008.1653 · arxiv_version: 1008.1653v1 · doi: 10.48550/arxiv.1008.1653 · pith_short_12: 7YSCNJDFKIB6 · pith_short_16: 7YSCNJDFKIB6YWCZ · pith_short_8: 7YSCNJDF

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/7YSCNJDFKIB6YWCZHU2U4TMAJU \
  | 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: fe2426a4655203ec58593d354e4d804d0b61ac6c39ab22aa18b10eab453342a1

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "8adb69c1d431405b14469e644b3fb8aa380b31f2d2d983acf02023ebf1b04f56",
    "cross_cats_sorted": [
      "cs.IT",
      "math.IT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.FL",
    "submitted_at": "2010-08-10T08:33:28Z",
    "title_canon_sha256": "8212ededf7796f21c1170d69910fa917ae4c6072a4692ff1dc424f82f4eea0a1"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1008.1653",
    "kind": "arxiv",
    "version": 1
  }
}