Pith Number

pith:EATEJYKZ

pith:2009:EATEJYKZMG6NZNZBDMBCH5XC7E

not attested not anchored not stored refs pending

Log canonical thresholds on Gorenstein canonical del Pezzo surfaces

Jihun Park, Joonyeong Won

arxiv:0904.4513 v2 · 2009-04-29 · 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{EATEJYKZMG6NZNZBDMBCH5XC7E}

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	2026-05-18T02:29:55.468770Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

202644e15961bcdcb7211b0223f6e2f918329f8451b10a58652e17304ea3eeda

Aliases

arxiv: 0904.4513 · arxiv_version: 0904.4513v2 · doi: 10.48550/arxiv.0904.4513 · pith_short_12: EATEJYKZMG6N · pith_short_16: EATEJYKZMG6NZNZB · pith_short_8: EATEJYKZ

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/EATEJYKZMG6NZNZBDMBCH5XC7E \
  | 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: 202644e15961bcdcb7211b0223f6e2f918329f8451b10a58652e17304ea3eeda

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "58464ae5b556d6cfa625b969c7193aca82b8fb9029e24f0c4d3e5e874f842d4b",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AG",
    "submitted_at": "2009-04-29T00:47:10Z",
    "title_canon_sha256": "a03697c9b4b5acacc45006f94dd8dfc5b6e1b5c510affcde05a4942afaa17e04"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0904.4513",
    "kind": "arxiv",
    "version": 2
  }
}