Pith Number

pith:7FMGVQBW

pith:2026:7FMGVQBW7BANHY63LW37GXYRS2

not attested not anchored not stored refs pending

Refined index obstructions for Brauer classes on an abelian variety

Eoin Mackall

arxiv:2605.26407 v1 · 2026-05-26 · math.AG · math.KT · math.RA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{7FMGVQBW7BANHY63LW37GXYRS2}

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	2026-05-27T01:05:16.433420Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f9586ac036f840d3e3db5db7f35f1196910542e13778e4e0dd43d8629ad34b67

Aliases

arxiv: 2605.26407 · arxiv_version: 2605.26407v1 · doi: 10.48550/arxiv.2605.26407 · pith_short_12: 7FMGVQBW7BAN · pith_short_16: 7FMGVQBW7BANHY63 · pith_short_8: 7FMGVQBW

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/7FMGVQBW7BANHY63LW37GXYRS2 \
  | 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: f9586ac036f840d3e3db5db7f35f1196910542e13778e4e0dd43d8629ad34b67

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "afe0924350a46c78a62873ddf4a5b1124dffbc4c532896bfb8da2abf1c7c77ff",
    "cross_cats_sorted": [
      "math.KT",
      "math.RA"
    ],
    "license": "http://creativecommons.org/licenses/by-nc-sa/4.0/",
    "primary_cat": "math.AG",
    "submitted_at": "2026-05-26T00:34:35Z",
    "title_canon_sha256": "b293dbf1831e598feb7da73b0b95df13a528e4fd7817182d3d63a6b698126b75"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.26407",
    "kind": "arxiv",
    "version": 1
  }
}