Pith Number

pith:PI56YIGI

pith:2018:PI56YIGIJDW3UNAL4ROUY2MWTT

not attested not anchored not stored refs pending

Leveraging Sparsity to Speed Up Polynomial Feature Expansions of CSR Matrices Using $K$-Simplex Numbers

Andrew Nystrom, John Hughes

arxiv:1803.06418 v3 · 2018-03-16 · cs.DS · 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{PI56YIGIJDW3UNAL4ROUY2MWTT}

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	2026-05-18T00:06:11.775144Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7a3bec20c848edba340be45d4c69969cda790792d76f773ca865109f2bea5a29

Aliases

arxiv: 1803.06418 · arxiv_version: 1803.06418v3 · doi: 10.48550/arxiv.1803.06418 · pith_short_12: PI56YIGIJDW3 · pith_short_16: PI56YIGIJDW3UNAL · pith_short_8: PI56YIGI

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/PI56YIGIJDW3UNAL4ROUY2MWTT \
  | 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: 7a3bec20c848edba340be45d4c69969cda790792d76f773ca865109f2bea5a29

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "fd5282d5b3426d67d2cb55a9ddc3399152abee00af314757724c784409e302b3",
    "cross_cats_sorted": [
      "cs.NA"
    ],
    "license": "http://creativecommons.org/licenses/by-nc-sa/4.0/",
    "primary_cat": "cs.DS",
    "submitted_at": "2018-03-16T22:24:32Z",
    "title_canon_sha256": "fb5d412919cd9a82373320189971aba51df5150246839d0bf50f12caa9e280f1"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1803.06418",
    "kind": "arxiv",
    "version": 3
  }
}