Pith Number

pith:IFO3R5AB

pith:2008:IFO3R5ABIREXZG6XR32D3C3BPP

not attested not anchored not stored refs pending

On "Regular Landsberg metrics are always Berwald" by Z. I. Szabo

Vladimir S. Matveev

arxiv:0809.1581 v1 · 2008-09-09 · math.DG · math.MG

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{IFO3R5ABIREXZG6XR32D3C3BPP}

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	2026-05-18T04:16:12.332769Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

415db8f40144497c9bd78ef43d8b617becf67fa2c6f8bb4709b66b847ee08c46

Aliases

arxiv: 0809.1581 · arxiv_version: 0809.1581v1 · doi: 10.48550/arxiv.0809.1581 · pith_short_12: IFO3R5ABIREX · pith_short_16: IFO3R5ABIREXZG6X · pith_short_8: IFO3R5AB

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/IFO3R5ABIREXZG6XR32D3C3BPP \
  | 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: 415db8f40144497c9bd78ef43d8b617becf67fa2c6f8bb4709b66b847ee08c46

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5250f712ad522c7d1a76ae3928c7eb828c7fae390b0f64741ac6dd766e50dd76",
    "cross_cats_sorted": [
      "math.MG"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.DG",
    "submitted_at": "2008-09-09T15:18:32Z",
    "title_canon_sha256": "e49231cc79ac44f7793efc96fbf7a51495bf5bc20be05d79bde93229b650569d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0809.1581",
    "kind": "arxiv",
    "version": 1
  }
}