Pith Number

pith:4ERYSBSI

pith:2016:4ERYSBSIWUMJSWNWP34A7FS75L

not attested not anchored not stored refs pending

Characterizations of projective spaces and quadrics by strictly nef bundles

Duo Li, Xiaokui Yang

arxiv:1609.06867 v3 · 2016-09-22 · 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{4ERYSBSIWUMJSWNWP34A7FS75L}

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	2026-05-18T00:24:54.482708Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e123890648b5189959b67ef80f965fead9b5c1916ba65915e7c93613dd5a7c7f

Aliases

arxiv: 1609.06867 · arxiv_version: 1609.06867v3 · doi: 10.48550/arxiv.1609.06867 · pith_short_12: 4ERYSBSIWUMJ · pith_short_16: 4ERYSBSIWUMJSWNW · pith_short_8: 4ERYSBSI

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/4ERYSBSIWUMJSWNWP34A7FS75L \
  | 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: e123890648b5189959b67ef80f965fead9b5c1916ba65915e7c93613dd5a7c7f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c4825c0ab6a31aa918c85aac80574c374b7c38a94bef29a51a9f235a234baf07",
    "cross_cats_sorted": [
      "math.DG"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AG",
    "submitted_at": "2016-09-22T08:32:32Z",
    "title_canon_sha256": "0741707138edcd42922a0c5f6ba358597c50ca479b46c7ebcca870896abaf59a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1609.06867",
    "kind": "arxiv",
    "version": 3
  }
}