Pith Number

pith:B4WEL7YP

pith:2009:B4WEL7YPLJSJAVMC7ALAX3J2OC

not attested not anchored not stored refs pending

Surgery obstructions on closed manifolds and the Inertia subgroup

Ian Hambleton

arxiv:0905.0104 v3 · 2009-05-01 · math.GT · math.AT

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{B4WEL7YPLJSJAVMC7ALAX3J2OC}

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	2026-05-18T04:40:57.407384Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

0f2c45ff0f5a64905582f8160bed3a708e8193535a1fd9e536581b7b3f67a230

Aliases

arxiv: 0905.0104 · arxiv_version: 0905.0104v3 · doi: 10.48550/arxiv.0905.0104 · pith_short_12: B4WEL7YPLJSJ · pith_short_16: B4WEL7YPLJSJAVMC · pith_short_8: B4WEL7YP

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/B4WEL7YPLJSJAVMC7ALAX3J2OC \
  | 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: 0f2c45ff0f5a64905582f8160bed3a708e8193535a1fd9e536581b7b3f67a230

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "026c372c4681fe580d9d863f7ab134df455f723f289a106a06c3151da1d1220b",
    "cross_cats_sorted": [
      "math.AT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.GT",
    "submitted_at": "2009-05-01T15:36:21Z",
    "title_canon_sha256": "6a6c672709bc9a5dcf27db63ccb4cd3a05448e673c163e73168d1ecbc9c9a11e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0905.0104",
    "kind": "arxiv",
    "version": 3
  }
}