Pith Number

pith:O2QMSZ4Z

pith:2012:O2QMSZ4ZQADPZE7RSLE5QFYU2Q

not attested not anchored not stored refs pending

Chern classes of free hypersurface arrangements

Paolo Aluffi

arxiv:1201.5396 v2 · 2012-01-25 · 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{O2QMSZ4ZQADPZE7RSLE5QFYU2Q}

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	2026-05-18T03:32:08.034539Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

76a0c967998006fc93f192c9d81714d41e6bdc304f62bc78aa8cc4652ee7bdbe

Aliases

arxiv: 1201.5396 · arxiv_version: 1201.5396v2 · doi: 10.48550/arxiv.1201.5396 · pith_short_12: O2QMSZ4ZQADP · pith_short_16: O2QMSZ4ZQADPZE7R · pith_short_8: O2QMSZ4Z

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/O2QMSZ4ZQADPZE7RSLE5QFYU2Q \
  | 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: 76a0c967998006fc93f192c9d81714d41e6bdc304f62bc78aa8cc4652ee7bdbe

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "25bbc4f3c99ba218d9667547b0401e1b797a016a59b7047eb8c778ec0c015709",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AG",
    "submitted_at": "2012-01-25T21:14:46Z",
    "title_canon_sha256": "ac4177064fa8ccc62c7e59c1635fc8d34ccd6f5bc3755bd26f832fbe293234cd"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1201.5396",
    "kind": "arxiv",
    "version": 2
  }
}