Pith Number

pith:YQDQBCEZ

pith:2008:YQDQBCEZ6FDI4EQ2IPWQXUMYNJ

not attested not anchored not stored refs pending

Contact homology of left-handed stabilizations and plumbing of open books

Frederic Bourgeois, Otto van Koert

arxiv:0803.0391 v1 · 2008-03-04 · math.SG · 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{YQDQBCEZ6FDI4EQ2IPWQXUMYNJ}

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	2026-05-18T00:01:23.905700Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c407008899f1468e121a43ed0bd1986a4279260ae7798b419d1e717fea89072f

Aliases

arxiv: 0803.0391 · arxiv_version: 0803.0391v1 · doi: 10.48550/arxiv.0803.0391 · pith_short_12: YQDQBCEZ6FDI · pith_short_16: YQDQBCEZ6FDI4EQ2 · pith_short_8: YQDQBCEZ

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/YQDQBCEZ6FDI4EQ2IPWQXUMYNJ \
  | 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: c407008899f1468e121a43ed0bd1986a4279260ae7798b419d1e717fea89072f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9ec8157b60f84e12966016a78cc22bbf963bb56c758f2facf9b386d723025696",
    "cross_cats_sorted": [
      "math.GT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.SG",
    "submitted_at": "2008-03-04T09:01:52Z",
    "title_canon_sha256": "da8ab6265c2dc44eb8ad73974ae499988c77579cfc1dabc357208bd945e70451"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0803.0391",
    "kind": "arxiv",
    "version": 1
  }
}