Pith Number

pith:RTUN7ZA6

pith:2015:RTUN7ZA65YGLQTRJD6CN32YRR5

not attested not anchored not stored refs pending

On the Brauer-Manin obstruction for degree four del Pezzo surfaces

Damaris Schindler, J\"org Jahnel

arxiv:1503.08292 v1 · 2015-03-28 · math.AG · math.NT

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{RTUN7ZA65YGLQTRJD6CN32YRR5}

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	2026-05-18T02:20:02.218452Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8ce8dfe41eee0cb84e291f84ddeb118f43de9ccce16767ba7864ef6542ba9ce5

Aliases

arxiv: 1503.08292 · arxiv_version: 1503.08292v1 · doi: 10.48550/arxiv.1503.08292 · pith_short_12: RTUN7ZA65YGL · pith_short_16: RTUN7ZA65YGLQTRJ · pith_short_8: RTUN7ZA6

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/RTUN7ZA65YGLQTRJD6CN32YRR5 \
  | 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: 8ce8dfe41eee0cb84e291f84ddeb118f43de9ccce16767ba7864ef6542ba9ce5

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d67b18937cf83daf252f5e34bec706fd122a89e182f5040f624d8f1020977b77",
    "cross_cats_sorted": [
      "math.NT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AG",
    "submitted_at": "2015-03-28T10:47:18Z",
    "title_canon_sha256": "f08dcb1aaa8272b7d8f5135e33d03e1164f2448e1257ac794405b1e2a3f46337"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1503.08292",
    "kind": "arxiv",
    "version": 1
  }
}