Pith Number

pith:3E554BML

pith:2015:3E554BMLVGHD7AKGGBUWHOETJE

not attested not anchored not stored refs pending

Cylinders in del Pezzo surfaces

Ivan Cheltsov, Jihun Park, Joonyeong Won

arxiv:1508.06375 v3 · 2015-08-26 · 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{3E554BMLVGHD7AKGGBUWHOETJE}

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	2026-05-17T23:50:43.033821Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d93bde058ba98e3f8146306963b8934914cd747dd6184d2cad25ee325bb62219

Aliases

arxiv: 1508.06375 · arxiv_version: 1508.06375v3 · doi: 10.48550/arxiv.1508.06375 · pith_short_12: 3E554BMLVGHD · pith_short_16: 3E554BMLVGHD7AKG · pith_short_8: 3E554BML

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/3E554BMLVGHD7AKGGBUWHOETJE \
  | 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: d93bde058ba98e3f8146306963b8934914cd747dd6184d2cad25ee325bb62219

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b4c633995fba14364d02c2b4b2b7e82f2dc8738a0290647a9cae3208d71f2b94",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AG",
    "submitted_at": "2015-08-26T06:34:25Z",
    "title_canon_sha256": "0b68e7eb1fddc51483402ef533795c5533c5857ae040d45e644754329df65554"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1508.06375",
    "kind": "arxiv",
    "version": 3
  }
}