Pith Number

pith:R6II26FV

pith:2015:R6II26FVLA4A3YMF3RIH5CTFN7

not attested not anchored not stored refs pending

Pseudo-inverses of difference matrices and their application to sparse signal approximation

Gerlind Plonka, Joachim Weickert, Sebastian Hoffmann

arxiv:1504.04266 v1 · 2015-04-16 · 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{R6II26FVLA4A3YMF3RIH5CTFN7}

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	2026-05-18T01:03:36.934741Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8f908d78b558380de185dc507e8a656ff6bab2be422cf83d8b84a46a4db6185e

Aliases

arxiv: 1504.04266 · arxiv_version: 1504.04266v1 · doi: 10.48550/arxiv.1504.04266 · pith_short_12: R6II26FVLA4A · pith_short_16: R6II26FVLA4A3YMF · pith_short_8: R6II26FV

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/R6II26FVLA4A3YMF3RIH5CTFN7 \
  | 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: 8f908d78b558380de185dc507e8a656ff6bab2be422cf83d8b84a46a4db6185e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "36c85dc2d5efe6a8349a7e4a5f33092378b526e59e9983ccc9ff99c9ce38ff6b",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2015-04-16T15:07:15Z",
    "title_canon_sha256": "813e3a5c9f0c3ebd1169b1138819074d0eb48bd51c50ba37317f6850ddfc7bfb"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1504.04266",
    "kind": "arxiv",
    "version": 1
  }
}