Pith Number

pith:IA7NLCMU

pith:2010:IA7NLCMU6RPASNSXMWSYMGUVIZ

not attested not anchored not stored refs pending

A Short Decidability Proof for DPDA Language Equivalence via First-Order Grammars

Petr Jancar

arxiv:1010.4760 v4 · 2010-10-22 · 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{IA7NLCMU6RPASNSXMWSYMGUVIZ}

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.

Cited by

1 paper in Pith

Simple grammar bisimilarity, with an application to session type equivalence

Receipt and verification

First computed	2026-05-18T04:27:06.496085Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

403ed58994f45e09365765a5861a9546568bf0a0b400f19e6f2ff356707b64fd

Aliases

arxiv: 1010.4760 · arxiv_version: 1010.4760v4 · doi: 10.48550/arxiv.1010.4760 · pith_short_12: IA7NLCMU6RPA · pith_short_16: IA7NLCMU6RPASNSX · pith_short_8: IA7NLCMU

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/IA7NLCMU6RPASNSXMWSYMGUVIZ \
  | 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: 403ed58994f45e09365765a5861a9546568bf0a0b400f19e6f2ff356707b64fd

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7e546bd996e4c56ebedf066b56179e30143e20f7f108e7428cbeb1996d064b38",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.FL",
    "submitted_at": "2010-10-22T17:20:28Z",
    "title_canon_sha256": "40c71e9b68e9c0b3f949959fef30b1170d5a381db88a10dc256d572c7388a97e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1010.4760",
    "kind": "arxiv",
    "version": 4
  }
}