Pith Number

pith:SMAQZB2H

pith:2015:SMAQZB2HYSAQTYK7C772AN263Q

not attested not anchored not stored refs pending

The open quadrant problem: A topological proof

Carlos Ueno, J.M. Gamboa, Jose F. Fernando

arxiv:1502.08035 v2 · 2015-02-27 · math.AG

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{SMAQZB2HYSAQTYK7C772AN263Q}

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	2026-05-18T02:25:39.891249Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

93010c8747c48109e15f17ffa0375edc166ec76c718b6b621ecfcb5bc477db50

Aliases

arxiv: 1502.08035 · arxiv_version: 1502.08035v2 · doi: 10.48550/arxiv.1502.08035 · pith_short_12: SMAQZB2HYSAQ · pith_short_16: SMAQZB2HYSAQTYK7 · pith_short_8: SMAQZB2H

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/SMAQZB2HYSAQTYK7C772AN263Q \
  | 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: 93010c8747c48109e15f17ffa0375edc166ec76c718b6b621ecfcb5bc477db50

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "005f2e079a192f9d7f5446c419d9b8c9677d7a4818c1e5646830c68eb410465f",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AG",
    "submitted_at": "2015-02-27T19:41:32Z",
    "title_canon_sha256": "a77a93c1496dc4d2ee6391a47e9d2c9432e471a61946e3fe709c4becfb2d80c0"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1502.08035",
    "kind": "arxiv",
    "version": 2
  }
}