Pith Number

pith:QIBHTY4X

pith:2009:QIBHTY4XCQUBOLKF4WU3RBGKOS

not attested not anchored not stored refs pending

Compatible contact structures of fibered Seifert links in homology 3-spheres

Masaharu Ishikawa

arxiv:0904.0837 v3 · 2009-04-06 · math.GT

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{QIBHTY4XCQUBOLKF4WU3RBGKOS}

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	2026-05-18T04:34:37.362904Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

820279e3971428172d45e5a9b884ca74971a66909b043a9acce67528e0a64829

Aliases

arxiv: 0904.0837 · arxiv_version: 0904.0837v3 · doi: 10.48550/arxiv.0904.0837 · pith_short_12: QIBHTY4XCQUB · pith_short_16: QIBHTY4XCQUBOLKF · pith_short_8: QIBHTY4X

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/QIBHTY4XCQUBOLKF4WU3RBGKOS \
  | 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: 820279e3971428172d45e5a9b884ca74971a66909b043a9acce67528e0a64829

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "bb72430f11064a8c1e50fd8b372873f400032024d64f44a498ca3147419d4993",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.GT",
    "submitted_at": "2009-04-06T03:22:15Z",
    "title_canon_sha256": "259bc7cd0c1eedb8281c9d8b42cb6ad53dfaf3b6722179644a02df6368f467c5"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0904.0837",
    "kind": "arxiv",
    "version": 3
  }
}