Pith Number

pith:OUAC6ALN

pith:2017:OUAC6ALNM3VNL67ROIHGZTNYN4

not attested not anchored not stored refs pending

Factor Models with Real Data: a Robust Estimation of the Number of Factors

Augusto Ferrante, Mattia Zorzi, Valentina Ciccone

arxiv:1709.01168 v2 · 2017-09-01 · math.OC

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{OUAC6ALNM3VNL67ROIHGZTNYN4}

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	2026-05-18T00:13:37.710834Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

75002f016d66ead5fbf1720e6ccdb86f3ccbd033aed5b9c6bda9a2882f4aced2

Aliases

arxiv: 1709.01168 · arxiv_version: 1709.01168v2 · doi: 10.48550/arxiv.1709.01168 · pith_short_12: OUAC6ALNM3VN · pith_short_16: OUAC6ALNM3VNL67R · pith_short_8: OUAC6ALN

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/OUAC6ALNM3VNL67ROIHGZTNYN4 \
  | 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: 75002f016d66ead5fbf1720e6ccdb86f3ccbd033aed5b9c6bda9a2882f4aced2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "37e25da6f8f06b7535d13ec51a878265c1447267f6c7ed3c0e4b544be5f445d3",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.OC",
    "submitted_at": "2017-09-01T09:04:17Z",
    "title_canon_sha256": "d08bd547f9a692002ac11efc5c5479ed1a31413924746f838671777026049cce"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1709.01168",
    "kind": "arxiv",
    "version": 2
  }
}