Pith Number

pith:PQLR7YDU

pith:2004:PQLR7YDUYPMIS2X2GRQ5NHJQSS

not attested not anchored not stored refs pending

Almost complex rigidity of the complex projective plane

Benjamin McKay (University College Cork)

arxiv:math/0403155 v2 · 2004-03-09 · math.SG · math.DG

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{PQLR7YDUYPMIS2X2GRQ5NHJQSS}

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	2026-05-18T04:40:09.640822Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7c171fe074c3d8896afa3461d69d30948b28c4327a5e0bb864a312a96e3af5d8

Aliases

arxiv: math/0403155 · arxiv_version: math/0403155v2 · doi: 10.48550/arxiv.math/0403155 · pith_short_12: PQLR7YDUYPMI · pith_short_16: PQLR7YDUYPMIS2X2 · pith_short_8: PQLR7YDU

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/PQLR7YDUYPMIS2X2GRQ5NHJQSS \
  | 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: 7c171fe074c3d8896afa3461d69d30948b28c4327a5e0bb864a312a96e3af5d8

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b87bb123946e1d97ba385f7275e057be667e3b9d61d940d89bec50681ee82804",
    "cross_cats_sorted": [
      "math.DG"
    ],
    "license": "",
    "primary_cat": "math.SG",
    "submitted_at": "2004-03-09T14:03:03Z",
    "title_canon_sha256": "33cb87fa523bea06de9b8bf45eb75ab2e9beb5fcdd03767de1d1977ea51bcea1"
  },
  "schema_version": "1.0",
  "source": {
    "id": "math/0403155",
    "kind": "arxiv",
    "version": 2
  }
}