Pith Number

pith:KOPI2I5O

pith:2013:KOPI2I5OSBVR3UPDFSCWNO5N5U

not attested not anchored not stored refs pending

A Counterexample to Guillemin's Zollfrei Conjecture

Stefan Suhr

arxiv:1302.2496 v1 · 2013-02-11 · math.DG

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{KOPI2I5OSBVR3UPDFSCWNO5N5U}

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	2026-05-18T02:58:23.663718Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

539e8d23ae906b1dd1e32c8566bbaded384f43d2a121d2acc48095e6eabc3906

Aliases

arxiv: 1302.2496 · arxiv_version: 1302.2496v1 · doi: 10.48550/arxiv.1302.2496 · pith_short_12: KOPI2I5OSBVR · pith_short_16: KOPI2I5OSBVR3UPD · pith_short_8: KOPI2I5O

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/KOPI2I5OSBVR3UPDFSCWNO5N5U \
  | 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: 539e8d23ae906b1dd1e32c8566bbaded384f43d2a121d2acc48095e6eabc3906

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "4da2558d23b51ec9d81b7f7a464b15a6e2640b5242fcb45710b2e6f1c7d51e43",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.DG",
    "submitted_at": "2013-02-11T15:14:17Z",
    "title_canon_sha256": "643c539156fa5cf04f889e4d8ccf7687393065090d39d97a809b89719ac74640"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1302.2496",
    "kind": "arxiv",
    "version": 1
  }
}