Pith Number

pith:LNS3HX3V

pith:2013:LNS3HX3V5U5KC6PZEFONA5VZXW

not attested not anchored not stored refs pending

Undecidability in binary tag systems and the Post correspondence problem for four pairs of words

Turlough Neary

arxiv:1312.6700 v1 · 2013-12-19 · cs.FL · cs.DS

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{LNS3HX3V5U5KC6PZEFONA5VZXW}

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	2026-05-18T03:03:56.318389Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

5b65b3df75ed3aa179f9215cd076b9bda11e127c8a95f1b7d6dd9e2fb7fdb145

Aliases

arxiv: 1312.6700 · arxiv_version: 1312.6700v1 · doi: 10.48550/arxiv.1312.6700 · pith_short_12: LNS3HX3V5U5K · pith_short_16: LNS3HX3V5U5KC6PZ · pith_short_8: LNS3HX3V

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/LNS3HX3V5U5KC6PZEFONA5VZXW \
  | 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: 5b65b3df75ed3aa179f9215cd076b9bda11e127c8a95f1b7d6dd9e2fb7fdb145

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f51dc085dc9431935b53f4e61649db9f99dc1b688b865aa30298ee4f12651d2e",
    "cross_cats_sorted": [
      "cs.DS"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.FL",
    "submitted_at": "2013-12-19T19:59:13Z",
    "title_canon_sha256": "519a65e2556388ef1191609e3201934f36ec844370050ddd590fd418442feed3"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1312.6700",
    "kind": "arxiv",
    "version": 1
  }
}