Pith Number

pith:4Z6YPIAX

pith:2018:4Z6YPIAXMU5XCLXCCIN7MYVJYM

not attested not anchored not stored refs pending

Unobstructedness of hyperk\"ahler twistor spaces

Ana-Maria Brecan, Martin Schwald, Tim Kirschner

arxiv:1810.01031 v1 · 2018-10-02 · math.AG · math.CV

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{4Z6YPIAXMU5XCLXCCIN7MYVJYM}

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	2026-05-18T00:04:19.135392Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e67d87a017653b712ee2121bf662a9c30408db532d2e5f540224a823a57d92c9

Aliases

arxiv: 1810.01031 · arxiv_version: 1810.01031v1 · doi: 10.48550/arxiv.1810.01031 · pith_short_12: 4Z6YPIAXMU5X · pith_short_16: 4Z6YPIAXMU5XCLXC · pith_short_8: 4Z6YPIAX

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/4Z6YPIAXMU5XCLXCCIN7MYVJYM \
  | 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: e67d87a017653b712ee2121bf662a9c30408db532d2e5f540224a823a57d92c9

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e5a95a1648d1258ebffbae8616934a29f5b831ed57cfca20a10fc908a8e841ec",
    "cross_cats_sorted": [
      "math.CV"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AG",
    "submitted_at": "2018-10-02T01:38:05Z",
    "title_canon_sha256": "116d326c09100c768a77e11dd775e6506eea7b58f5a52868a4ccb13f85592b4d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1810.01031",
    "kind": "arxiv",
    "version": 1
  }
}