Pith Number

pith:LDW3E3FT

pith:2009:LDW3E3FTUAMKR4TGGWUBG2O3ET

not attested not anchored not stored refs pending

Secondary Stiefel-Whitney class and diffeomorphisms of rational and ruled symplectic 4-manifolds

Vsevolod Shevchishin

arxiv:0904.0283 v2 · 2009-04-02 · 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{LDW3E3FTUAMKR4TGGWUBG2O3ET}

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	2026-05-18T04:35:15.033713Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

58edb26cb3a018a8f26635a81369db24d0543e840bbd325bfd5a3b0566c09156

Aliases

arxiv: 0904.0283 · arxiv_version: 0904.0283v2 · doi: 10.48550/arxiv.0904.0283 · pith_short_12: LDW3E3FTUAMK · pith_short_16: LDW3E3FTUAMKR4TG · pith_short_8: LDW3E3FT

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/LDW3E3FTUAMKR4TGGWUBG2O3ET \
  | 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: 58edb26cb3a018a8f26635a81369db24d0543e840bbd325bfd5a3b0566c09156

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b8b45aaf861c2501f03eeea145029cb12219df4e181a587ce48b497454f95a75",
    "cross_cats_sorted": [
      "math.GT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.SG",
    "submitted_at": "2009-04-02T01:37:02Z",
    "title_canon_sha256": "128b248c44e96dd748d7a469376c30e549274c640724dc6ad937d1ff32c0d36f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0904.0283",
    "kind": "arxiv",
    "version": 2
  }
}