Pith Number

pith:IB2KTIME

pith:2021:IB2KTIMEZZ6Y2MMU2UDIM5EA5J

not attested not anchored not stored refs pending

Sparse Principal Components Analysis: a Tutorial

Giovanni Maria Merola

arxiv:2105.13581 v1 · 2021-05-28 · stat.ME

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{IB2KTIMEZZ6Y2MMU2UDIM5EA5J}

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	2026-07-05T02:44:09.731981Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

4074a9a184ce7d8d3194d506867480ea796252f3cc26eeae80b33109ce4223c9

Aliases

arxiv: 2105.13581 · arxiv_version: 2105.13581v1 · doi: 10.48550/arxiv.2105.13581 · pith_short_12: IB2KTIMEZZ6Y · pith_short_16: IB2KTIMEZZ6Y2MMU · pith_short_8: IB2KTIME

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/IB2KTIMEZZ6Y2MMU2UDIM5EA5J \
  | 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: 4074a9a184ce7d8d3194d506867480ea796252f3cc26eeae80b33109ce4223c9

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2e390528ee89e4472730cf75988c632cf56b815f85f6e573efc77dbdbe922ec8",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by-nc-nd/4.0/",
    "primary_cat": "stat.ME",
    "submitted_at": "2021-05-28T04:23:39Z",
    "title_canon_sha256": "0711f3b3d72569c31fdd4c776156481585572847c15cca47863e6af90dfba8fd"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2105.13581",
    "kind": "arxiv",
    "version": 1
  }
}