Pith Number

pith:OY3EPTA5

pith:2020:OY3EPTA5ZJUDTNIVSQBGWU5MYQ

not attested not anchored not stored refs pending

A kernel Principal Component Analysis (kPCA) digest with a new backward mapping (pre-image reconstruction) strategy

Alberto Garc\'ia-Gonz\'alez, Antonio Huerta, Pedro D\'iez, Sergio Zlotnik

arxiv:2001.01958 v2 · 2020-01-07 · math.NA · cs.LG · cs.NA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{OY3EPTA5ZJUDTNIVSQBGWU5MYQ}

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	2026-07-05T02:06:44.041153Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

763647cc1dca6839b51594026b53acc4347bb6de41ef8fd3fa05964d739e2e0b

Aliases

arxiv: 2001.01958 · arxiv_version: 2001.01958v2 · doi: 10.48550/arxiv.2001.01958 · pith_short_12: OY3EPTA5ZJUD · pith_short_16: OY3EPTA5ZJUDTNIV · pith_short_8: OY3EPTA5

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/OY3EPTA5ZJUDTNIVSQBGWU5MYQ \
  | 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: 763647cc1dca6839b51594026b53acc4347bb6de41ef8fd3fa05964d739e2e0b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9e92a9d7e1297864b7b3d4735c6e9d642b3b6b48c6c183e1f68461843dfb8416",
    "cross_cats_sorted": [
      "cs.LG",
      "cs.NA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2020-01-07T10:30:16Z",
    "title_canon_sha256": "4027eeba45a1356661a8f3442e764341a7773f257480012a349ba27b5e12ab31"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2001.01958",
    "kind": "arxiv",
    "version": 2
  }
}