Pith Number

pith:I47Y4QOZ

pith:2015:I47Y4QOZDXKS4QG3GMNCPXE2AQ

not attested not anchored not stored refs pending

Doubling construction of Calabi-Yau fourfolds from toric Fano fourfolds

Mamoru Doi, Naoto Yotsutani

arxiv:1502.00208 v2 · 2015-02-01 · math.DG · 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{I47Y4QOZDXKS4QG3GMNCPXE2AQ}

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	2026-05-18T02:09:54.233850Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

473f8e41d91dd52e40db331a27dc9a041fd88a203508633150af2a204d51bc3f

Aliases

arxiv: 1502.00208 · arxiv_version: 1502.00208v2 · doi: 10.48550/arxiv.1502.00208 · pith_short_12: I47Y4QOZDXKS · pith_short_16: I47Y4QOZDXKS4QG3 · pith_short_8: I47Y4QOZ

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/I47Y4QOZDXKS4QG3GMNCPXE2AQ \
  | 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: 473f8e41d91dd52e40db331a27dc9a041fd88a203508633150af2a204d51bc3f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "17e07c4691f9381ef2909783e441c85687177ec74c9586dac4234fdd6eb123b9",
    "cross_cats_sorted": [
      "math.AG"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.DG",
    "submitted_at": "2015-02-01T07:21:21Z",
    "title_canon_sha256": "72db2350a755f980ed77e03c3e7a85eb2683545229ddc9a5774b9ef631bbd169"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1502.00208",
    "kind": "arxiv",
    "version": 2
  }
}