Pith Number

pith:KG5KK74R

pith:2019:KG5KK74RB6AY5FJAD32EYSJ7H7

not attested not anchored not stored refs pending

A class of perverse schobers in Geometric Invariant Theory

Michel Van den Bergh, \v{S}pela \v{S}penko

arxiv:1908.04213 v2 · 2019-08-12 · math.AG · math.RT

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{KG5KK74RB6AY5FJAD32EYSJ7H7}

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	2026-07-05T00:02:28.435590Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

51baa57f910f818e95201ef44c493f3fe8a8b2ed7449e3ffd20dc30b11ab214f

Aliases

arxiv: 1908.04213 · arxiv_version: 1908.04213v2 · doi: 10.48550/arxiv.1908.04213 · pith_short_12: KG5KK74RB6AY · pith_short_16: KG5KK74RB6AY5FJA · pith_short_8: KG5KK74R

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/KG5KK74RB6AY5FJAD32EYSJ7H7 \
  | 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: 51baa57f910f818e95201ef44c493f3fe8a8b2ed7449e3ffd20dc30b11ab214f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9fc7d837e2cd372ffb1f7205465ed6ce671fc58d4f1928435cb33b1484b7e56d",
    "cross_cats_sorted": [
      "math.RT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AG",
    "submitted_at": "2019-08-12T15:51:04Z",
    "title_canon_sha256": "f4d8a767a5508c60d2ea331d5f4837e084ad83d13387dfee9423d49a349db88d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1908.04213",
    "kind": "arxiv",
    "version": 2
  }
}