Pith Number

pith:Y3QHENVL

pith:2018:Y3QHENVLU5CP7LSCP46FJXCQJL

not attested not anchored not stored refs pending

Twistors, quartics, and del Pezzo fibrations

Nobuhiro Honda

arxiv:1810.13030 v1 · 2018-10-30 · math.AG · math.DG

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{Y3QHENVLU5CP7LSCP46FJXCQJL}

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	2026-05-18T00:01:52.439799Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c6e07236aba744ffae427f3c54dc504acef0574959dc867a59d2181dfc3edda9

Aliases

arxiv: 1810.13030 · arxiv_version: 1810.13030v1 · doi: 10.48550/arxiv.1810.13030 · pith_short_12: Y3QHENVLU5CP · pith_short_16: Y3QHENVLU5CP7LSC · pith_short_8: Y3QHENVL

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/Y3QHENVLU5CP7LSCP46FJXCQJL \
  | 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: c6e07236aba744ffae427f3c54dc504acef0574959dc867a59d2181dfc3edda9

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3e245c051527613125d64a295849bcb253e630a418e6cbcb63cd4c94460f2b57",
    "cross_cats_sorted": [
      "math.DG"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AG",
    "submitted_at": "2018-10-30T23:19:30Z",
    "title_canon_sha256": "fd5e6e5e7f9d7b1008c510afb2fba56eec18340fd78dc03e2619bbd47cf6baca"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1810.13030",
    "kind": "arxiv",
    "version": 1
  }
}