Pith Number

pith:BCOY7ROE

pith:2015:BCOY7ROEOWRHK52QQHKVYO4RCJ

not attested not anchored not stored refs pending

A rigid Calabi-Yau manifold with Picard number two

Eberhard Freitag

arxiv:1506.00892 v1 · 2015-06-02 · 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{BCOY7ROEOWRHK52QQHKVYO4RCJ}

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	2026-05-18T01:59:34.164953Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

089d8fc5c475a275775081d55c3b911250eb4c2295acface5bfbae89f61db207

Aliases

arxiv: 1506.00892 · arxiv_version: 1506.00892v1 · doi: 10.48550/arxiv.1506.00892 · pith_short_12: BCOY7ROEOWRH · pith_short_16: BCOY7ROEOWRHK52Q · pith_short_8: BCOY7ROE

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/BCOY7ROEOWRHK52QQHKVYO4RCJ \
  | 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: 089d8fc5c475a275775081d55c3b911250eb4c2295acface5bfbae89f61db207

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7563b825ef763702a7d65f3730991daed652d076fe3473a02c04efca128ff275",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AG",
    "submitted_at": "2015-06-02T14:07:06Z",
    "title_canon_sha256": "6b8cb663297b29554401d85d995f7329a7b06da863d2625ef73d59d741cf6df5"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1506.00892",
    "kind": "arxiv",
    "version": 1
  }
}