Pith Number

pith:HKZ7UUP2

pith:2011:HKZ7UUP2BDCEGF5MMCSMWLSRNT

not attested not anchored not stored refs pending

Quasi-Polish Spaces

Matthew de Brecht

arxiv:1108.1445 v2 · 2011-08-06 · math.LO · 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{HKZ7UUP2BDCEGF5MMCSMWLSRNT}

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	2026-05-18T03:41:29.625391Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3ab3fa51fa08c44317ac60a4cb2e516cd81178ad1aff27c32bef7792e5dab08d

Aliases

arxiv: 1108.1445 · arxiv_version: 1108.1445v2 · doi: 10.48550/arxiv.1108.1445 · pith_short_12: HKZ7UUP2BDCE · pith_short_16: HKZ7UUP2BDCEGF5M · pith_short_8: HKZ7UUP2

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/HKZ7UUP2BDCEGF5MMCSMWLSRNT \
  | 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: 3ab3fa51fa08c44317ac60a4cb2e516cd81178ad1aff27c32bef7792e5dab08d

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9dcdae5f34745d1408d189c428cff70a4b393170da6e498db49fedd058776231",
    "cross_cats_sorted": [
      "cs.LO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.LO",
    "submitted_at": "2011-08-06T03:52:15Z",
    "title_canon_sha256": "5e20b41317db1cad30ecf27ca2b4361af59acb2d464f86d2bbd7fec0b9a3f28e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1108.1445",
    "kind": "arxiv",
    "version": 2
  }
}