Pith Number

pith:VE4RJV4W

pith:2018:VE4RJV4WMEVGYVGWDC6R4WBZEZ

not attested not anchored not stored refs pending

Blow ups of $\mathbb{P^n}$ as quiver moduli for exceptional collections

Xuqiang Qin

arxiv:1804.09544 v2 · 2018-04-23 · 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{VE4RJV4WMEVGYVGWDC6R4WBZEZ}

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	2026-05-18T00:16:15.862563Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a93914d796612a6c54d618bd1e58392666c05aa9acfb091d4f1fed40d60c655a

Aliases

arxiv: 1804.09544 · arxiv_version: 1804.09544v2 · doi: 10.48550/arxiv.1804.09544 · pith_short_12: VE4RJV4WMEVG · pith_short_16: VE4RJV4WMEVGYVGW · pith_short_8: VE4RJV4W

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/VE4RJV4WMEVGYVGWDC6R4WBZEZ \
  | 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: a93914d796612a6c54d618bd1e58392666c05aa9acfb091d4f1fed40d60c655a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3ea9b7245010f6f12ba7d34a7389f3d0ba1778b1459b72c5e18b3bfed8c8a1f5",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AG",
    "submitted_at": "2018-04-23T23:20:06Z",
    "title_canon_sha256": "00515aad054c7a7c9d597caaa4e9f3fc661037cce982091a737d000573423556"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1804.09544",
    "kind": "arxiv",
    "version": 2
  }
}