Pith Number

pith:EVFGPUPU

pith:2009:EVFGPUPULYOP27CRELOA6MQGTC

not attested not anchored not stored refs pending

Chow groups and derived categories of K3 surfaces

Daniel Huybrechts

arxiv:0912.5299 v1 · 2009-12-29 · math.AG · math.CT

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{EVFGPUPULYOP27CRELOA6MQGTC}

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	2026-05-18T02:43:24.749288Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

254a67d1f45e1cfd7c5122dc0f32069881bbf21f9efe823b46b7d991bd26459c

Aliases

arxiv: 0912.5299 · arxiv_version: 0912.5299v1 · doi: 10.48550/arxiv.0912.5299 · pith_short_12: EVFGPUPULYOP · pith_short_16: EVFGPUPULYOP27CR · pith_short_8: EVFGPUPU

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/EVFGPUPULYOP27CRELOA6MQGTC \
  | 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: 254a67d1f45e1cfd7c5122dc0f32069881bbf21f9efe823b46b7d991bd26459c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "90f4266f8156c0b22d97f06accfff8f0f930778d1b82c41f29e5a4d1181cc5ab",
    "cross_cats_sorted": [
      "math.CT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AG",
    "submitted_at": "2009-12-29T12:50:50Z",
    "title_canon_sha256": "060801f7bb3bfdd031d53314cdff18f17302213b7bb4bd9c7fabd90519bc4ce7"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0912.5299",
    "kind": "arxiv",
    "version": 1
  }
}