Pith Number

pith:QIGK2W7B

pith:2019:QIGK2W7BIJWUOWPHCY5HBEIBAO

not attested not anchored not stored refs pending

Vanishing of the Brauer group of a del Pezzo surface of degree 4

Manar Riman

arxiv:1907.08810 v1 · 2019-07-20 · math.NT · 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{QIGK2W7BIJWUOWPHCY5HBEIBAO}

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	2026-05-17T23:40:03.039395Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

820cad5be1426d4759e7163a7091010396e7acf300cc63a42ce7e8f9e2847654

Aliases

arxiv: 1907.08810 · arxiv_version: 1907.08810v1 · doi: 10.48550/arxiv.1907.08810 · pith_short_12: QIGK2W7BIJWU · pith_short_16: QIGK2W7BIJWUOWPH · pith_short_8: QIGK2W7B

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/QIGK2W7BIJWUOWPHCY5HBEIBAO \
  | 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: 820cad5be1426d4759e7163a7091010396e7acf300cc63a42ce7e8f9e2847654

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2d0c01f69cfdf9718e09123426ba663fd1233621f80679fe26d099b2ff6c8574",
    "cross_cats_sorted": [
      "math.AG"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NT",
    "submitted_at": "2019-07-20T13:35:25Z",
    "title_canon_sha256": "8969148014e9aa25a5fb01d3d5106025851deff263f77a6729f888f10bedeab8"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1907.08810",
    "kind": "arxiv",
    "version": 1
  }
}