Pith Number

pith:QBDFJ72C

pith:1994:QBDFJ72CXTBD5MP7NJCLV55UTI

not attested not anchored not stored refs pending

The Deformation Space of Calabi-Yau n-folds with canonical singularities can be obstructed

Mark Gross

arxiv:alg-geom/9402014 v1 · 1994-02-25 · alg-geom · 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{QBDFJ72CXTBD5MP7NJCLV55UTI}

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.

Cited by

1 paper in Pith

Beyond Algebraic Superstring Compactification: Part II

Receipt and verification

First computed	2026-07-04T15:08:02.054261Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

804654ff42bcc23eb1ff6a44baf7b49a1a559eaa451fc04227319bd14a699699

Aliases

arxiv: alg-geom/9402014 · arxiv_version: alg-geom/9402014v1 · doi: 10.48550/arxiv.alg-geom/9402014 · pith_short_12: QBDFJ72CXTBD · pith_short_16: QBDFJ72CXTBD5MP7 · pith_short_8: QBDFJ72C

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/QBDFJ72CXTBD5MP7NJCLV55UTI \
  | 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: 804654ff42bcc23eb1ff6a44baf7b49a1a559eaa451fc04227319bd14a699699

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b7a4a0dd1c096e53c518e740e8b35d260600921ed64a8ba96ca2de6b48619ba4",
    "cross_cats_sorted": [
      "math.AG"
    ],
    "license": "",
    "primary_cat": "alg-geom",
    "submitted_at": "1994-02-25T14:02:42Z",
    "title_canon_sha256": "cf0f2ac2030b2f646a9b5413b85f7af04ccc18c41735098b495126d08ae657bf"
  },
  "schema_version": "1.0",
  "source": {
    "id": "alg-geom/9402014",
    "kind": "arxiv",
    "version": 1
  }
}