Pith Number

pith:ZB6WNHVE

pith:2006:ZB6WNHVEWL3VNKVVYSEHF6BC65

not attested not anchored not stored refs pending

Selfdual 4-Manifolds, Projective Surfaces, and the Dunajski-West Construction

David M. J. Calderbank

arxiv:math/0606754 v3 · 2006-06-29 · math.DG · math.AG

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{ZB6WNHVEWL3VNKVVYSEHF6BC65}

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	2026-05-18T02:55:19.468819Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c87d669ea4b2f756aab5c48872f822f76ac66a71ff382f9e78ced99c6936c78e

Aliases

arxiv: math/0606754 · arxiv_version: math/0606754v3 · doi: 10.48550/arxiv.math/0606754 · pith_short_12: ZB6WNHVEWL3V · pith_short_16: ZB6WNHVEWL3VNKVV · pith_short_8: ZB6WNHVE

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/ZB6WNHVEWL3VNKVVYSEHF6BC65 \
  | 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: c87d669ea4b2f756aab5c48872f822f76ac66a71ff382f9e78ced99c6936c78e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "4392f1cf6040306c69df20674bc6f56b142d6eb612585eb0d2ace74508cde8a6",
    "cross_cats_sorted": [
      "math.AG"
    ],
    "license": "http://creativecommons.org/licenses/by-nc-sa/3.0/",
    "primary_cat": "math.DG",
    "submitted_at": "2006-06-29T12:42:45Z",
    "title_canon_sha256": "199cbec2e772e2580d0db9ab3bf174f97de33c2c331a2e95ca4f53d1f0c5a42e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "math/0606754",
    "kind": "arxiv",
    "version": 3
  }
}