Pith Number

pith:TTKYJRHF

pith:2019:TTKYJRHF4WLY3NP3RR3IBREQRG

not attested not anchored not stored refs pending

On the Robust PCA and Weiszfeld's Algorithm

Gabriele Steidl, Max Nimmer, Sebastian Neumayer, Simon Setzer

arxiv:1902.04292 v1 · 2019-02-12 · 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{TTKYJRHF4WLY3NP3RR3IBREQRG}

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	2026-05-17T23:54:12.647054Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

9cd584c4e5e5978db5fb8c7680c490899e7168d0cc4fedcdc175d79260204578

Aliases

arxiv: 1902.04292 · arxiv_version: 1902.04292v1 · doi: 10.48550/arxiv.1902.04292 · pith_short_12: TTKYJRHF4WLY · pith_short_16: TTKYJRHF4WLY3NP3 · pith_short_8: TTKYJRHF

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/TTKYJRHF4WLY3NP3RR3IBREQRG \
  | 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: 9cd584c4e5e5978db5fb8c7680c490899e7168d0cc4fedcdc175d79260204578

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "55a2d47658ba5e570d038ed35025c5e046af2bb41504e3f1ae9d121420d88270",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2019-02-12T09:39:46Z",
    "title_canon_sha256": "8837003618ed59daca7c631e1c25e65723c20f0c1d7c136508155d430e0db582"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1902.04292",
    "kind": "arxiv",
    "version": 1
  }
}