Pith Number

pith:NPU6V7ES

pith:2018:NPU6V7ESM533L4NS6CVVDKYJB6

not attested not anchored not stored refs pending

Regularization of covariance matrices on Riemannian manifolds using linear systems

Lipeng Ning

arxiv:1805.11699 v1 · 2018-05-29 · math.MG · cs.IT · math.IT · 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{NPU6V7ESM533L4NS6CVVDKYJB6}

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	2026-05-18T00:14:36.885877Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6be9eafc926777b5f1b2f0ab51ab090fa7bf134fab631d76064e41810eb81194

Aliases

arxiv: 1805.11699 · arxiv_version: 1805.11699v1 · doi: 10.48550/arxiv.1805.11699 · pith_short_12: NPU6V7ESM533 · pith_short_16: NPU6V7ESM533L4NS · pith_short_8: NPU6V7ES

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/NPU6V7ESM533L4NS6CVVDKYJB6 \
  | 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: 6be9eafc926777b5f1b2f0ab51ab090fa7bf134fab631d76064e41810eb81194

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "63408919efb8ccbdddfc330acf96c3c4c1cb920bd73bc1742cc5f16687ca460a",
    "cross_cats_sorted": [
      "cs.IT",
      "math.IT",
      "math.OC"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.MG",
    "submitted_at": "2018-05-29T20:27:20Z",
    "title_canon_sha256": "22b13db11254090015c75d48472edebf6ca1966b036cc5ea2de7e07f6c1f8d5e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1805.11699",
    "kind": "arxiv",
    "version": 1
  }
}