Pith Number

pith:HFASEPD7

pith:2015:HFASEPD7U3NODDLUXKZTZFQHU6

not attested not anchored not stored refs pending

Blocked rank-revealing QR factorizations: How randomized sampling can be used to avoid single-vector pivoting

P.G. Martinsson

arxiv:1505.08115 v1 · 2015-05-29 · math.NA · 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{HFASEPD7U3NODDLUXKZTZFQHU6}

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	2026-05-18T01:59:59.653090Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3941223c7fa6dae18d74bab33c9607a7ada91aee3e4546ea57964664dc71370c

Aliases

arxiv: 1505.08115 · arxiv_version: 1505.08115v1 · doi: 10.48550/arxiv.1505.08115 · pith_short_12: HFASEPD7U3NO · pith_short_16: HFASEPD7U3NODDLU · pith_short_8: HFASEPD7

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/HFASEPD7U3NODDLUXKZTZFQHU6 \
  | 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: 3941223c7fa6dae18d74bab33c9607a7ada91aee3e4546ea57964664dc71370c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c9ef6809454a70f5f6afea33e4e30feffde7bb0a5187f3e3018de9cbd2ba2ccb",
    "cross_cats_sorted": [
      "cs.NA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2015-05-29T17:31:35Z",
    "title_canon_sha256": "7c63624bfe21b03514b89f8f677a8ae9ce42bb568879cc586e8d4d0e2b350754"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1505.08115",
    "kind": "arxiv",
    "version": 1
  }
}