Pith Number

pith:P5TJZ6CU

pith:2020:P5TJZ6CUJ2OCP7BITWVSB2FEAM

not attested not anchored not stored refs pending

Projection-Cost-Preserving Sketches: Proof Strategies and Constructions

Cameron Musco, Christopher Musco

arxiv:2004.08434 v1 · 2020-04-17 · cs.DS · cs.LG · cs.NA · math.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{P5TJZ6CUJ2OCP7BITWVSB2FEAM}

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.

Cited by

1 paper in Pith

Quasi-optimal hierarchically semi-separable matrix approximation

Receipt and verification

First computed	2026-07-05T00:56:05.973668Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7f669cf8544e9c27fc289dab20e8a4033ae09a41dc09d5a6f8fbc5794a91759f

Aliases

arxiv: 2004.08434 · arxiv_version: 2004.08434v1 · doi: 10.48550/arxiv.2004.08434 · pith_short_12: P5TJZ6CUJ2OC · pith_short_16: P5TJZ6CUJ2OCP7BI · pith_short_8: P5TJZ6CU

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/P5TJZ6CUJ2OCP7BITWVSB2FEAM \
  | 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: 7f669cf8544e9c27fc289dab20e8a4033ae09a41dc09d5a6f8fbc5794a91759f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "dd8eb7d359e7dfe029338c96a8c67d41464e2804d847dff0f24c87bbf2919f79",
    "cross_cats_sorted": [
      "cs.LG",
      "cs.NA",
      "math.NA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DS",
    "submitted_at": "2020-04-17T19:56:46Z",
    "title_canon_sha256": "632d133fbd80ca8bcb78019ccbe5cc962e103f566254f34961849836038277e0"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2004.08434",
    "kind": "arxiv",
    "version": 1
  }
}