Pith Number

pith:OPKI2T5I

pith:2009:OPKI2T5IMYO37WYHZAO73PEK2E

not attested not anchored not stored refs pending

Milnor fibre boundary of a non-isolated surface singularity

Agnes Szilard, Andras Nemethi

arxiv:0909.0354 v2 · 2009-09-02 · 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{OPKI2T5IMYO37WYHZAO73PEK2E}

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	2026-05-18T04:19:33.599345Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

73d48d4fa8661dbfdb07c81dfdbc8ad13f7ad8580b59479d88009b506ea83d8c

Aliases

arxiv: 0909.0354 · arxiv_version: 0909.0354v2 · doi: 10.48550/arxiv.0909.0354 · pith_short_12: OPKI2T5IMYO3 · pith_short_16: OPKI2T5IMYO37WYH · pith_short_8: OPKI2T5I

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/OPKI2T5IMYO37WYHZAO73PEK2E \
  | 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: 73d48d4fa8661dbfdb07c81dfdbc8ad13f7ad8580b59479d88009b506ea83d8c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5e2e1a46183b73842feb8b155f820b05158a74945a89e36f8136147398f94566",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AG",
    "submitted_at": "2009-09-02T08:58:49Z",
    "title_canon_sha256": "fc861f988fcce4ac3f1a79d0e1af9a253446bda90bea7f236a2e2ca517d82944"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0909.0354",
    "kind": "arxiv",
    "version": 2
  }
}