Pith Number

pith:UNSWJN4B

pith:2012:UNSWJN4BZPL2LWZMEBPCLJ5D3S

not attested not anchored not stored refs pending

The Parametric Ordinal-Recursive Complexity of Post Embedding Problems

Prateek Karandikar, Sylvain Schmitz

arxiv:1211.5259 v1 · 2012-11-22 · cs.LO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{UNSWJN4BZPL2LWZMEBPCLJ5D3S}

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	2026-05-18T03:15:20.915272Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a36564b781cbd7a5db2c205e25a7a3dca1d1dba57ae913f732e2ab2cbf8423f4

Aliases

arxiv: 1211.5259 · arxiv_version: 1211.5259v1 · doi: 10.48550/arxiv.1211.5259 · pith_short_12: UNSWJN4BZPL2 · pith_short_16: UNSWJN4BZPL2LWZM · pith_short_8: UNSWJN4B

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/UNSWJN4BZPL2LWZMEBPCLJ5D3S \
  | 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: a36564b781cbd7a5db2c205e25a7a3dca1d1dba57ae913f732e2ab2cbf8423f4

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "fb8f46b04c8d17ff362d0304c9a917e077d9126a47e7e50aed0fc189af4362d9",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.LO",
    "submitted_at": "2012-11-22T11:14:32Z",
    "title_canon_sha256": "f7db4bea4a7b76b15c4d953934d2a0a533044fe76da1f19e23dd52b9a684dd35"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1211.5259",
    "kind": "arxiv",
    "version": 1
  }
}