Pith Number

pith:6EQPR6O2

pith:2025:6EQPR6O2RAANPV6S4IOOYE33HR

not attested not anchored not stored refs pending

Ineffectiveness for Search and Undecidability of PCSP Meta-Problems

Alberto Larrauri

arxiv:2504.04639 v4 · 2025-04-06 · cs.CC · cs.CL · cs.DS · 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{6EQPR6O2RAANPV6S4IOOYE33HR}

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	2026-05-26T02:05:00.123285Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f120f8f9da8800d7d7d2e21cec137b3c5df59f16f3f9d17c7a2a2500413ba5a7

Aliases

arxiv: 2504.04639 · arxiv_version: 2504.04639v4 · doi: 10.48550/arxiv.2504.04639 · pith_short_12: 6EQPR6O2RAAN · pith_short_16: 6EQPR6O2RAANPV6S · pith_short_8: 6EQPR6O2

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/6EQPR6O2RAANPV6S4IOOYE33HR \
  | 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: f120f8f9da8800d7d7d2e21cec137b3c5df59f16f3f9d17c7a2a2500413ba5a7

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "efc71b38e1f86656ab11f6e5203905cc33ea61d81b0c4d8cf4e73775d783188f",
    "cross_cats_sorted": [
      "cs.CL",
      "cs.DS",
      "cs.LO"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "cs.CC",
    "submitted_at": "2025-04-06T23:08:05Z",
    "title_canon_sha256": "e46fc9b32dab6973a156f27ad0f6a8490b8bd755ee81a94245443809d40dac76"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2504.04639",
    "kind": "arxiv",
    "version": 4
  }
}