Pith Number

pith:FVPG7Y7P

pith:2015:FVPG7Y7PRUH6CGUVZ5SZVPNK4G

not attested not anchored not stored refs pending

The K3 category of a cubic fourfold

Daniel Huybrechts

arxiv:1505.01775 v3 · 2015-05-07 · 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{FVPG7Y7PRUH6CGUVZ5SZVPNK4G}

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	2026-05-17T23:53:13.866806Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2d5e6fe3ef8d0fe11a95cf659abdaae195f5756b9516ecc2230e97e11b790c98

Aliases

arxiv: 1505.01775 · arxiv_version: 1505.01775v3 · doi: 10.48550/arxiv.1505.01775 · pith_short_12: FVPG7Y7PRUH6 · pith_short_16: FVPG7Y7PRUH6CGUV · pith_short_8: FVPG7Y7P

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/FVPG7Y7PRUH6CGUVZ5SZVPNK4G \
  | 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: 2d5e6fe3ef8d0fe11a95cf659abdaae195f5756b9516ecc2230e97e11b790c98

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "8e45c920c74720a8df82966331d56459ab6e0ba7aa4db6c15a2bf88d37b8dddb",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AG",
    "submitted_at": "2015-05-07T16:56:12Z",
    "title_canon_sha256": "c2324c42356a2c28e2a083713b4fa1a37ad3c27f80c13314701915c48a8baf54"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1505.01775",
    "kind": "arxiv",
    "version": 3
  }
}