Pith Number

pith:VQAL6VRV

pith:2017:VQAL6VRVE7HJF54GL6HT6SWSQD

not attested not anchored not stored refs pending

SMASH: Structured matrix approximation by separation and hierarchy

Difeng Cai, Edmond Chow, Yousef Saad, Yuanzhe Xi

arxiv:1705.05443 v1 · 2017-05-15 · 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{VQAL6VRVE7HJF54GL6HT6SWSQD}

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	2026-05-18T00:44:22.722032Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ac00bf563527ce92f7865f8f3f4ad280db8631e2368368a6a46c7d3b784a64fb

Aliases

arxiv: 1705.05443 · arxiv_version: 1705.05443v1 · doi: 10.48550/arxiv.1705.05443 · pith_short_12: VQAL6VRVE7HJ · pith_short_16: VQAL6VRVE7HJF54G · pith_short_8: VQAL6VRV

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/VQAL6VRVE7HJF54GL6HT6SWSQD \
  | 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: ac00bf563527ce92f7865f8f3f4ad280db8631e2368368a6a46c7d3b784a64fb

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9cec89eb7e22487f7e40a01f9f7db5bf44ebfc3c98d6f6d606867fdfe1ac5641",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2017-05-15T20:42:17Z",
    "title_canon_sha256": "8b0c77f9881bb0ed9669ac29333ce504cf13af425b46f9b09398fb33aee6763a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1705.05443",
    "kind": "arxiv",
    "version": 1
  }
}