Pith Number

pith:BJBNCZXG

pith:2013:BJBNCZXGBYYVTPHVHCN77HREEF

not attested not anchored not stored refs pending

Note on Undecidability of Bisimilarity for Second-Order Pushdown Processes

Ji\v{r}\'i Srba, Petr Jan\v{c}ar

arxiv:1303.0780 v1 · 2013-03-04 · 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{BJBNCZXGBYYVTPHVHCN77HREEF}

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	2026-05-18T03:31:54.983573Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

0a42d166e60e3159bcf5389bff9e24214f7cf416c22f4bf08ebce1af5d089ec4

Aliases

arxiv: 1303.0780 · arxiv_version: 1303.0780v1 · doi: 10.48550/arxiv.1303.0780 · pith_short_12: BJBNCZXGBYYV · pith_short_16: BJBNCZXGBYYVTPHV · pith_short_8: BJBNCZXG

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/BJBNCZXGBYYVTPHVHCN77HREEF \
  | 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: 0a42d166e60e3159bcf5389bff9e24214f7cf416c22f4bf08ebce1af5d089ec4

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "af1f312a87044ccf5644383bf50adfae198e3a6eee326d0fe2e188ff038866b5",
    "cross_cats_sorted": [
      "cs.FL"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.LO",
    "submitted_at": "2013-03-04T18:51:48Z",
    "title_canon_sha256": "b0c269b410888876e95509ff21fa4adb4939fc4272f29ae14e041572a41d14af"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1303.0780",
    "kind": "arxiv",
    "version": 1
  }
}