Pith Number

pith:REY6S7QW

pith:2013:REY6S7QWNZAZS5UQ7FG22PFAVE

not attested not anchored not stored refs pending

Reachability Problem for Weak Multi-Pushdown Automata

Piotr Hofman (University of Warsaw), S{\l}awomir Lasota (University of Warsaw), Wojciech Czerwi\'nski (Universit\"at Bayreuth)

arxiv:1308.3996 v3 · 2013-08-19 · cs.LO · 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{REY6S7QWNZAZS5UQ7FG22PFAVE}

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	2026-05-18T01:37:37.910171Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8931e97e166e41997690f94dad3ca0a908db43bf3d8db4f404351ccb97c553b5

Aliases

arxiv: 1308.3996 · arxiv_version: 1308.3996v3 · doi: 10.48550/arxiv.1308.3996 · pith_short_12: REY6S7QWNZAZ · pith_short_16: REY6S7QWNZAZS5UQ · pith_short_8: REY6S7QW

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/REY6S7QWNZAZS5UQ7FG22PFAVE \
  | 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: 8931e97e166e41997690f94dad3ca0a908db43bf3d8db4f404351ccb97c553b5

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "bceadd8aa187022c4347d239189a033866f88cd9c22fb60f3713c518c33492d4",
    "cross_cats_sorted": [
      "cs.FL"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.LO",
    "submitted_at": "2013-08-19T12:09:44Z",
    "title_canon_sha256": "05cddd6bd7be7c0f7d016194eac74465c2c2bf40d04b9f0da73f275bcbe5c062"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1308.3996",
    "kind": "arxiv",
    "version": 3
  }
}