Pith Number

pith:OKBH6PUD

pith:2015:OKBH6PUDYYFJ6UWFHGXCVZCXFX

not attested not anchored not stored refs pending

On del Pezzo elliptic varieties of degree $\leq 4$

Andrea Luigi Tironi, Antonio Laface, Luca Ugaglia

arxiv:1509.09220 v1 · 2015-09-30 · 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{OKBH6PUDYYFJ6UWFHGXCVZCXFX}

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	2026-05-18T01:31:26.800122Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

72827f3e83c60a9f52c539ae2ae4572de97bc84125d1543576d4a84bc2c6a6e3

Aliases

arxiv: 1509.09220 · arxiv_version: 1509.09220v1 · doi: 10.48550/arxiv.1509.09220 · pith_short_12: OKBH6PUDYYFJ · pith_short_16: OKBH6PUDYYFJ6UWF · pith_short_8: OKBH6PUD

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/OKBH6PUDYYFJ6UWFHGXCVZCXFX \
  | 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: 72827f3e83c60a9f52c539ae2ae4572de97bc84125d1543576d4a84bc2c6a6e3

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "14914c3611eff660012e06a0592fabb783c14440d4fc0098e4549da0e492f132",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AG",
    "submitted_at": "2015-09-30T15:25:39Z",
    "title_canon_sha256": "1084f38f12c10fb46e494d6344e654d76c6788f5ea1b5f0cd2578322e1e776fe"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1509.09220",
    "kind": "arxiv",
    "version": 1
  }
}