Pith Number

pith:QAF2FZUF

pith:2017:QAF2FZUF4RAAXRH2BNNFE4K5O7

not attested not anchored not stored refs pending

Regularization matrices for discrete ill-posed problems in several space-dimensions

Guangxin Huang, Laura Dykes, Lothar Reichel, Silvia Noschese

arxiv:1705.06489 v1 · 2017-05-18 · 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{QAF2FZUF4RAAXRH2BNNFE4K5O7}

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	2026-05-18T00:44:14.559416Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

800ba2e685e4400bc4fa0b5a52715d77d3267980347c7c31b33b86acceb95f5e

Aliases

arxiv: 1705.06489 · arxiv_version: 1705.06489v1 · doi: 10.48550/arxiv.1705.06489 · pith_short_12: QAF2FZUF4RAA · pith_short_16: QAF2FZUF4RAAXRH2 · pith_short_8: QAF2FZUF

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/QAF2FZUF4RAAXRH2BNNFE4K5O7 \
  | 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: 800ba2e685e4400bc4fa0b5a52715d77d3267980347c7c31b33b86acceb95f5e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "0e70e6cacaf21a3d2054bc7c3afb7e6f84da92caedd1b3d65be62ebc3b005019",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2017-05-18T09:23:07Z",
    "title_canon_sha256": "892e9f9310a4f8d26cb2b68ec91dbe30a70aff95071bd5580c7a79e01f78fd29"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1705.06489",
    "kind": "arxiv",
    "version": 1
  }
}