Pith Number

pith:44PBABCM

pith:2018:44PBABCMZPDLAQLNCV2J3GSM6Q

not attested not anchored not stored refs pending

Matrix rigidity and the ill-posedness of Robust PCA and matrix completion

Andrew Thompson, Jared Tanner, Simon Vary

arxiv:1811.05919 v2 · 2018-11-14 · math.NA · cs.IT · cs.NA · math.IT

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{44PBABCMZPDLAQLNCV2J3GSM6Q}

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	2026-05-17T23:40:55.694437Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e71e10044ccbc6b0416d15749d9a4cf40418b5a0412b4aaf1a0fb4bbaf061b21

Aliases

arxiv: 1811.05919 · arxiv_version: 1811.05919v2 · doi: 10.48550/arxiv.1811.05919 · pith_short_12: 44PBABCMZPDL · pith_short_16: 44PBABCMZPDLAQLN · pith_short_8: 44PBABCM

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/44PBABCMZPDLAQLNCV2J3GSM6Q \
  | 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: e71e10044ccbc6b0416d15749d9a4cf40418b5a0412b4aaf1a0fb4bbaf061b21

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "17e19d0cdfb85f8a0f28bb27aab94a48fb2500d1c68730b5c86b4c1d3798ec8c",
    "cross_cats_sorted": [
      "cs.IT",
      "cs.NA",
      "math.IT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2018-11-14T17:27:24Z",
    "title_canon_sha256": "b1fd67a535aa2bf0278a61dbaab2ebdaa7cfc758f528e5c3279bd4a993bd77b4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1811.05919",
    "kind": "arxiv",
    "version": 2
  }
}