Pith Number

pith:KTHC2LEB

pith:2008:KTHC2LEBXPO2OKNQGOO6DUP2BW

not attested not anchored not stored refs pending

On non-formality of a simply-connected symplectic 8-manifold

Gil R. Cavalcanti, Marisa Fernandez, Vicente Munoz

arxiv:0801.4248 v1 · 2008-01-28 · math.SG

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{KTHC2LEBXPO2OKNQGOO6DUP2BW}

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	2026-05-18T04:20:22.519954Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

54ce2d2c81bbdda729b0339de1d1fa0d938b9cf89b81a18fbef5576c8f7d44fc

Aliases

arxiv: 0801.4248 · arxiv_version: 0801.4248v1 · doi: 10.48550/arxiv.0801.4248 · pith_short_12: KTHC2LEBXPO2 · pith_short_16: KTHC2LEBXPO2OKNQ · pith_short_8: KTHC2LEB

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/KTHC2LEBXPO2OKNQGOO6DUP2BW \
  | 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: 54ce2d2c81bbdda729b0339de1d1fa0d938b9cf89b81a18fbef5576c8f7d44fc

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "bb47db18e981928f60083c8ee381799b9e1a7440b743a036ec4dbfef3d5f7013",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "math.SG",
    "submitted_at": "2008-01-28T11:34:31Z",
    "title_canon_sha256": "89c05712b1dcdb339be4f5871447cf2d7ff50aab5c521374dec68242ce0e213c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0801.4248",
    "kind": "arxiv",
    "version": 1
  }
}