Pith Number

pith:QBO5LGKI

pith:2019:QBO5LGKIXAHQRS3RFEG4E6LESU

not attested not anchored not stored refs pending

Sheaf homology of hyperplane arrangements, Boolean covers and exterior powers

Brent Everitt, Paul Turner

arxiv:1908.04500 v2 · 2019-08-13 · math.AT · math.CO · math.GR

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{QBO5LGKIXAHQRS3RFEG4E6LESU}

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	2026-07-05T07:26:34.284074Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

805dd59948b80f08cb71290dc27964952a54a814d945217b533d53232f53a6a6

Aliases

arxiv: 1908.04500 · arxiv_version: 1908.04500v2 · doi: 10.48550/arxiv.1908.04500 · pith_short_12: QBO5LGKIXAHQ · pith_short_16: QBO5LGKIXAHQRS3R · pith_short_8: QBO5LGKI

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/QBO5LGKIXAHQRS3RFEG4E6LESU \
  | 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: 805dd59948b80f08cb71290dc27964952a54a814d945217b533d53232f53a6a6

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d2cf42fac77213a3d42113eab727283ec8274079dc250e7429a4e8b80adeaf3b",
    "cross_cats_sorted": [
      "math.CO",
      "math.GR"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AT",
    "submitted_at": "2019-08-13T05:54:32Z",
    "title_canon_sha256": "00d485d01efc805f8c4c7922c846e6cbaef3b7a6ff66403b65a390870346ad42"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1908.04500",
    "kind": "arxiv",
    "version": 2
  }
}