Pith Number

pith:PAD7CUHL

pith:2001:PAD7CUHL2SXXC33JD45AKBUUKL

not attested not anchored not stored refs pending

The geometry of weakly selfdual Kahler surfaces

David M.J. Calderbank, Paul Gauduchon, Vestislav Apostolov

arxiv:math/0104233 v2 · 2001-04-25 · math.DG · math.AG

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Add to your LaTeX paper

\usepackage{pith}
\pithnumber{PAD7CUHL2SXXC33JD45AKBUUKL}

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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.

Cited by

1 paper in Pith

All toric Kahler surfaces with twistor 2-forms

Receipt and verification

First computed	2026-07-04T14:35:18.576146Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7807f150ebd4af716f691f3a05069452faa82d574e1a94e353b87ffd4718776e

Aliases

arxiv: math/0104233 · arxiv_version: math/0104233v2 · doi: 10.48550/arxiv.math/0104233 · pith_short_12: PAD7CUHL2SXX · pith_short_16: PAD7CUHL2SXXC33J · pith_short_8: PAD7CUHL

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/PAD7CUHL2SXXC33JD45AKBUUKL \
  | 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: 7807f150ebd4af716f691f3a05069452faa82d574e1a94e353b87ffd4718776e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "95e61fd8028f5b66729f07c60bcc39976a1589fb818f29ca157b4767c6549f99",
    "cross_cats_sorted": [
      "math.AG"
    ],
    "license": "",
    "primary_cat": "math.DG",
    "submitted_at": "2001-04-25T14:11:49Z",
    "title_canon_sha256": "d6e928f0e2c3d2b9ff4460795c4c270ec94bc3857ff8ee021d7c39eef296105b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "math/0104233",
    "kind": "arxiv",
    "version": 2
  }
}