Pith Number

pith:ULUQDMTG

pith:2018:ULUQDMTGOF6AAF6QQB6JMDCAP2

not attested not anchored not stored refs pending

Low-Rank Matrix Approximations Do Not Need a Singular Value Gap

Ilse C.F. Ipsen, Petros Drineas

arxiv:1801.00670 v1 · 2018-01-02 · 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{ULUQDMTGOF6AAF6QQB6JMDCAP2}

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	2026-05-18T00:26:52.683310Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a2e901b266717c0017d0807c960c407e84118e7bf7f6db407233b0a16787003e

Aliases

arxiv: 1801.00670 · arxiv_version: 1801.00670v1 · doi: 10.48550/arxiv.1801.00670 · pith_short_12: ULUQDMTGOF6A · pith_short_16: ULUQDMTGOF6AAF6Q · pith_short_8: ULUQDMTG

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/ULUQDMTGOF6AAF6QQB6JMDCAP2 \
  | 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: a2e901b266717c0017d0807c960c407e84118e7bf7f6db407233b0a16787003e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d5c4607af8636feba863fa5ecf910f817a205db2f4992be824ceabe9b801fa1b",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2018-01-02T14:43:51Z",
    "title_canon_sha256": "54e9fd5612f8badf49a2431db3946b33fa5ec3c09535120b266e3845f7fc4e1c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1801.00670",
    "kind": "arxiv",
    "version": 1
  }
}