Pith Number

pith:RW4HAINF

pith:2025:RW4HAINFQS6MST5LJOGIC7YSM2

not attested not anchored not stored refs pending

Quasi-optimal hierarchically semi-separable matrix approximation

Cameron Musco, Christopher Musco, David Persson, Diana Halikias, Feyza Duman Keles, Noah Amsel, Tyler Chen

arxiv:2505.16937 v2 · 2025-05-22 · math.NA · 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{RW4HAINFQS6MST5LJOGIC7YSM2}

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	2026-07-05T12:06:12.816283Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8db87021a584bcc94fab4b8c817f1266a8474cee13116cfc3fe886e60e321404

Aliases

arxiv: 2505.16937 · arxiv_version: 2505.16937v2 · doi: 10.48550/arxiv.2505.16937 · pith_short_12: RW4HAINFQS6M · pith_short_16: RW4HAINFQS6MST5L · pith_short_8: RW4HAINF

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/RW4HAINFQS6MST5LJOGIC7YSM2 \
  | 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: 8db87021a584bcc94fab4b8c817f1266a8474cee13116cfc3fe886e60e321404

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b7fa4661337c4cfc6ea6177f18f5072315258465743189815433efc2078a8eba",
    "cross_cats_sorted": [
      "cs.DS",
      "cs.NA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2025-05-22T17:27:40Z",
    "title_canon_sha256": "afe3b61db94fb67afea15895062db32c00ca49ec3acb94525c67e754af64c5b5"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2505.16937",
    "kind": "arxiv",
    "version": 2
  }
}