Pith Number

pith:UF4W7TKF

pith:2026:UF4W7TKF7MNIK4VHDKLZYFETDC

not attested not anchored not stored refs pending

Exceptional collections for canonical stacks of log del Pezzo surfaces with $\frac13(1,1)$ singularities

Alex Junior Gomez Saltachin

arxiv:2606.18238 v1 · 2026-06-16 · 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{UF4W7TKF7MNIK4VHDKLZYFETDC}

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	2026-06-19T16:10:52.002952Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a1796fcd45fb1a8572a71a979c149318bfa640f641787d23dd4c6b55f854982c

Aliases

arxiv: 2606.18238 · arxiv_version: 2606.18238v1 · doi: 10.48550/arxiv.2606.18238 · pith_short_12: UF4W7TKF7MNI · pith_short_16: UF4W7TKF7MNIK4VH · pith_short_8: UF4W7TKF

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/UF4W7TKF7MNIK4VHDKLZYFETDC \
  | 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: a1796fcd45fb1a8572a71a979c149318bfa640f641787d23dd4c6b55f854982c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e63162720a4504d8ec9d86be64b7e4e7aee882aa93f33e5788331e4b8249816c",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AG",
    "submitted_at": "2026-06-16T17:58:07Z",
    "title_canon_sha256": "43e4d5e193386cd5a8070265b71be120f5869fa51dd8234664c5b3cc6cf2c180"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2606.18238",
    "kind": "arxiv",
    "version": 1
  }
}