Pith Number

pith:OB6XTA7N

pith:2018:OB6XTA7NLPC3P3JLADOQWVMOVJ

not attested not anchored not stored refs pending

Hirzebruch-Kummer covers of algebraic surfaces

Piotr Pokora

arxiv:1805.01215 v2 · 2018-05-03 · math.AG

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{OB6XTA7NLPC3P3JLADOQWVMOVJ}

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	2026-05-17T23:55:42.857756Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

707d7983ed5bc5b7ed2b00dd0b558eaa6e89cd43ffd23a3efad57796334db54d

Aliases

arxiv: 1805.01215 · arxiv_version: 1805.01215v2 · doi: 10.48550/arxiv.1805.01215 · pith_short_12: OB6XTA7NLPC3 · pith_short_16: OB6XTA7NLPC3P3JL · pith_short_8: OB6XTA7N

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/OB6XTA7NLPC3P3JLADOQWVMOVJ \
  | 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: 707d7983ed5bc5b7ed2b00dd0b558eaa6e89cd43ffd23a3efad57796334db54d

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "eb8b597a91a8efb9705445f87655324fb4908e6ff897cccf7b6de70f4b393994",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "math.AG",
    "submitted_at": "2018-05-03T10:49:52Z",
    "title_canon_sha256": "f77476062a02d9a59edececf447571875287f99a57952c556fd879e0b94b7a5e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1805.01215",
    "kind": "arxiv",
    "version": 2
  }
}