Pith Number

pith:2HDQMIHA

pith:2009:2HDQMIHADTEC6QZVUVUKVOCPVR

not attested not anchored not stored refs pending

Local solution and extension to the Calabi flow

Weiyong He

arxiv:0904.0978 v2 · 2009-04-06 · math.DG · math.AP

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{2HDQMIHADTEC6QZVUVUKVOCPVR}

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	2026-07-04T15:41:21.703031Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d1c70620e01cc82f4335a568aab84fac4ac7ceb453bd073c481bb57ab3ed6ac4

Aliases

arxiv: 0904.0978 · arxiv_version: 0904.0978v2 · doi: 10.48550/arxiv.0904.0978 · pith_short_12: 2HDQMIHADTEC · pith_short_16: 2HDQMIHADTEC6QZV · pith_short_8: 2HDQMIHA

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/2HDQMIHADTEC6QZVUVUKVOCPVR \
  | 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: d1c70620e01cc82f4335a568aab84fac4ac7ceb453bd073c481bb57ab3ed6ac4

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f9ec5d811b4dbacd0cfca144697fd0869baea3c6d748f81e8322eee46a0dac93",
    "cross_cats_sorted": [
      "math.AP"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.DG",
    "submitted_at": "2009-04-06T17:53:39Z",
    "title_canon_sha256": "dbb725635fe6553d509076236f29ba0bae166f2906174987ffecc8fa82e27a94"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0904.0978",
    "kind": "arxiv",
    "version": 2
  }
}