Pith Number

pith:H6BSZXYN

pith:2009:H6BSZXYNGYOAFTS5RVGIBOEHVN

not attested not anchored not stored refs pending

An extension of Fujita's non extendability theorem for Grassmannians

Gianluca Occhetta, Luis E. Sola Conde, Roberto Munoz

arxiv:0906.4695 v1 · 2009-06-25 · 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{H6BSZXYNGYOAFTS5RVGIBOEHVN}

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	2026-05-18T02:25:26.885607Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3f832cdf0d361c02ce5d8d4c80b887ab54ad8014810312acfa2b6ef44518aec0

Aliases

arxiv: 0906.4695 · arxiv_version: 0906.4695v1 · doi: 10.48550/arxiv.0906.4695 · pith_short_12: H6BSZXYNGYOA · pith_short_16: H6BSZXYNGYOAFTS5 · pith_short_8: H6BSZXYN

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/H6BSZXYNGYOAFTS5RVGIBOEHVN \
  | 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: 3f832cdf0d361c02ce5d8d4c80b887ab54ad8014810312acfa2b6ef44518aec0

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b5cee2778f295f1cca7e886a6215613d531a995c4142f38e885f26b48d70fe48",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AG",
    "submitted_at": "2009-06-25T13:54:28Z",
    "title_canon_sha256": "17d6cf8431f783c226b04eaf6a3f4da2d6ad3be965f8605308e730b3ae9aa78b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0906.4695",
    "kind": "arxiv",
    "version": 1
  }
}