Pith Number

pith:KPYKQWXS

pith:2026:KPYKQWXSRFCLSRP5BXNATCROCR

not attested not anchored not stored refs pending

On first-order definable operations on relational structures

Bruno Courcelle

arxiv:2605.31260 v1 · 2026-05-29 · 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{KPYKQWXSRFCLSRP5BXNATCROCR}

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	2026-06-01T01:04:07.257575Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

53f0a85af28944b945fd0dda098a2e14703f762c3ea5220c55248098b978b627

Aliases

arxiv: 2605.31260 · arxiv_version: 2605.31260v1 · doi: 10.48550/arxiv.2605.31260 · pith_short_12: KPYKQWXSRFCL · pith_short_16: KPYKQWXSRFCLSRP5 · pith_short_8: KPYKQWXS

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/KPYKQWXSRFCLSRP5BXNATCROCR \
  | 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: 53f0a85af28944b945fd0dda098a2e14703f762c3ea5220c55248098b978b627

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "8874460db0ca457b615fa751a6ef60309d7c440db7db4c26e3a837a56b876b0e",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "cs.LO",
    "submitted_at": "2026-05-29T12:55:03Z",
    "title_canon_sha256": "2c0c5f22cbeadc8455e61e466e4c3e78247e069bf8bc987608316c145cbf0e03"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.31260",
    "kind": "arxiv",
    "version": 1
  }
}