Pith Number

pith:H4ZCBKXP

pith:2026:H4ZCBKXPBJFVQ5WH6BX6DVXKCL

not attested not anchored not stored refs pending

Graph-Regularized Low-Rank Matrix Completion by Variable Projection

Beno\^it Loucheur, Michel Journ\'ee, P.-A. Absil

arxiv:2607.09546 v1 · 2026-07-10 · cs.LG · cs.NA · math.NA · math.OC

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{H4ZCBKXPBJFVQ5WH6BX6DVXKCL}

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	2026-07-13T01:20:18.695038Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3f3220aaef0a4b5876c7f06fe1d6ea12dfd1ecca665e57a8488fa222c480f3fd

Aliases

arxiv: 2607.09546 · arxiv_version: 2607.09546v1 · doi: 10.48550/arxiv.2607.09546 · pith_short_12: H4ZCBKXPBJFV · pith_short_16: H4ZCBKXPBJFVQ5WH · pith_short_8: H4ZCBKXP

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/H4ZCBKXPBJFVQ5WH6BX6DVXKCL \
  | 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: 3f3220aaef0a4b5876c7f06fe1d6ea12dfd1ecca665e57a8488fa222c480f3fd

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "4dbe597a14cd7648f46501c27936669bab0ae1a7ba90d3b2ffa5b1ec69b2fa88",
    "cross_cats_sorted": [
      "cs.NA",
      "math.NA",
      "math.OC"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "cs.LG",
    "submitted_at": "2026-07-10T15:57:02Z",
    "title_canon_sha256": "e6bb2dd62d5bf55953457189bccfc241000d38b94fe16abb83e99f5f701e6477"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2607.09546",
    "kind": "arxiv",
    "version": 1
  }
}