Pith Number

pith:Y7N4S2CB

pith:2013:Y7N4S2CBZK2SRAHCPGRZHN5FQB

not attested not anchored not stored refs pending

Some Hierarchies of QCB_0-Spaces

Matthias Schroeder, Victor Selivanov

arxiv:1304.1647 v1 · 2013-04-05 · cs.LO · math.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{Y7N4S2CBZK2SRAHCPGRZHN5FQB}

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	2026-05-18T03:28:55.089528Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c7dbc96841cab52880e279a393b7a5805a93b67b659dcf7a466172ca836c1097

Aliases

arxiv: 1304.1647 · arxiv_version: 1304.1647v1 · doi: 10.48550/arxiv.1304.1647 · pith_short_12: Y7N4S2CBZK2S · pith_short_16: Y7N4S2CBZK2SRAHC · pith_short_8: Y7N4S2CB

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/Y7N4S2CBZK2SRAHCPGRZHN5FQB \
  | 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: c7dbc96841cab52880e279a393b7a5805a93b67b659dcf7a466172ca836c1097

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "89239efa10f01fd4596b553c2e371be003df59991e9ea7fbacdd9adec459ecdf",
    "cross_cats_sorted": [
      "math.LO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.LO",
    "submitted_at": "2013-04-05T09:00:07Z",
    "title_canon_sha256": "213f600d7ee37835e3f84d437d44997cca2de6ab7ac9c6993bef40b29cc5c610"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1304.1647",
    "kind": "arxiv",
    "version": 1
  }
}