Pith Number

pith:HQ4BDJXQ

pith:2018:HQ4BDJXQDMMSL7PPTTKXCYC6NJ

not attested not anchored not stored refs pending

A combinatorial characterization of Hurewicz cofibrations between finite topological spaces

Miguel Ottina, Nicol\'as Cianci

arxiv:1802.10006 v1 · 2018-02-27 · math.AT · math.CO

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{HQ4BDJXQDMMSL7PPTTKXCYC6NJ}

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	2026-05-18T00:22:21.610635Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3c3811a6f01b1925fdef9cd571605e6a6929932ed741f7e8e75c6531cc37e656

Aliases

arxiv: 1802.10006 · arxiv_version: 1802.10006v1 · doi: 10.48550/arxiv.1802.10006 · pith_short_12: HQ4BDJXQDMMS · pith_short_16: HQ4BDJXQDMMSL7PP · pith_short_8: HQ4BDJXQ

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/HQ4BDJXQDMMSL7PPTTKXCYC6NJ \
  | 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: 3c3811a6f01b1925fdef9cd571605e6a6929932ed741f7e8e75c6531cc37e656

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f5b557e6358623a7b4531d21b782815f34339afad36e72aef5ec3b4effdf3a47",
    "cross_cats_sorted": [
      "math.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AT",
    "submitted_at": "2018-02-27T16:27:28Z",
    "title_canon_sha256": "aa94070a353320d08e561ad9273f1a56331533a91a78c9e344e422a20c2e31cc"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1802.10006",
    "kind": "arxiv",
    "version": 1
  }
}