Pith Number

pith:4XMRERJI

pith:2016:4XMRERJIJPD4A5JSVQZMEI2YKW

not attested not anchored not stored refs pending

The Diagonal Problem for Higher-Order Recursion Schemes is Decidable

Igor Walukiewicz, Lorenzo Clemente, Pawe{\l} Parys, Sylvain Salvati

arxiv:1605.00371 v1 · 2016-05-02 · cs.FL · 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{4XMRERJIJPD4A5JSVQZMEI2YKW}

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	2026-05-18T01:15:56.010206Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e5d91245284bc7c07532ac32c22358559abd33bbed8aa8f1ee2bfde1241a16f1

Aliases

arxiv: 1605.00371 · arxiv_version: 1605.00371v1 · doi: 10.48550/arxiv.1605.00371 · pith_short_12: 4XMRERJIJPD4 · pith_short_16: 4XMRERJIJPD4A5JS · pith_short_8: 4XMRERJI

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/4XMRERJIJPD4A5JSVQZMEI2YKW \
  | 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: e5d91245284bc7c07532ac32c22358559abd33bbed8aa8f1ee2bfde1241a16f1

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d0285f541b7879c5f5abc2d8bf1ee16e4c81d4804114c504ce6f4906c3e5426d",
    "cross_cats_sorted": [
      "cs.LO"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "cs.FL",
    "submitted_at": "2016-05-02T07:15:16Z",
    "title_canon_sha256": "4b555ba6ec4e2110dea821cf912a8fa9ea79b4ab1c2995b5bfd8c0fb6d7e242f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1605.00371",
    "kind": "arxiv",
    "version": 1
  }
}