Pith Number

pith:WHF3HDQ5

pith:2015:WHF3HDQ54R6NKCRZ34E3C3YA4R

not attested not anchored not stored refs pending

Unirationality of del Pezzo surfaces of degree two over finite fields

Dino Festi, Ronald van Luijk

arxiv:1505.01145 v1 · 2015-05-05 · 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{WHF3HDQ54R6NKCRZ34E3C3YA4R}

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	2026-05-18T00:44:28.402996Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b1cbb38e1de47cd50a39df09b16f00e4476ab7201614dc4e782a2eb9b7844dbc

Aliases

arxiv: 1505.01145 · arxiv_version: 1505.01145v1 · doi: 10.48550/arxiv.1505.01145 · pith_short_12: WHF3HDQ54R6N · pith_short_16: WHF3HDQ54R6NKCRZ · pith_short_8: WHF3HDQ5

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/WHF3HDQ54R6NKCRZ34E3C3YA4R \
  | 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: b1cbb38e1de47cd50a39df09b16f00e4476ab7201614dc4e782a2eb9b7844dbc

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "1d52eb691584d31dae380d3b1b5fd272208b538319b9114ac1cbdfa6ef3d5700",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AG",
    "submitted_at": "2015-05-05T19:53:58Z",
    "title_canon_sha256": "35209cc4486dcfe5299d443e0239ec9040ec73b0cb571557d53066651b592a6a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1505.01145",
    "kind": "arxiv",
    "version": 1
  }
}