Pith Number

pith:QU3RSE3N

pith:2012:QU3RSE3NNRXQ7DQT2ACONOF443

not attested not anchored not stored refs pending

The Effect of Coherence on Sampling from Matrices with Orthonormal Columns, and Preconditioned Least Squares Problems

Ilse C. F. Ipsen, Thomas Wentworth

arxiv:1203.4809 v3 · 2012-03-21 · 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{QU3RSE3NNRXQ7DQT2ACONOF443}

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	2026-05-18T02:57:06.979491Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

853719136d6c6f0f8e13d004e6b8bce6ca053897a6645081331bb485c0c0a7ec

Aliases

arxiv: 1203.4809 · arxiv_version: 1203.4809v3 · doi: 10.48550/arxiv.1203.4809 · pith_short_12: QU3RSE3NNRXQ · pith_short_16: QU3RSE3NNRXQ7DQT · pith_short_8: QU3RSE3N

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/QU3RSE3NNRXQ7DQT2ACONOF443 \
  | 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: 853719136d6c6f0f8e13d004e6b8bce6ca053897a6645081331bb485c0c0a7ec

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "8441ae7537d99e2bc204329cda836e808825573852fcb856f996f536d3c20479",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2012-03-21T19:55:30Z",
    "title_canon_sha256": "861c7816f8f2192d6ff989d6e1ecad79580e7c89a96c5234a2be085835741804"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1203.4809",
    "kind": "arxiv",
    "version": 3
  }
}