Pith Number

pith:J4EREFFS

pith:2007:J4EREFFSXOGIRFILOJF65U5P2P

not attested not anchored not stored refs pending

A Semismooth Newton Method for Tikhonov Functionals with Sparsity Constraints

Dirk A. Lorenz, Roland Griesse

arxiv:0709.3186 v3 · 2007-09-20 · math.OC · math.NA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{J4EREFFSXOGIRFILOJF65U5P2P}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more

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	2026-05-18T04:38:51.067252Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

4f091214b2bb8c88950b724beed3afd3f15a0fa9d9c94a236f85f3b094aa0264

Aliases

arxiv: 0709.3186 · arxiv_version: 0709.3186v3 · doi: 10.48550/arxiv.0709.3186 · pith_short_12: J4EREFFSXOGI · pith_short_16: J4EREFFSXOGIRFIL · pith_short_8: J4EREFFS

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/J4EREFFSXOGIRFILOJF65U5P2P \
  | 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: 4f091214b2bb8c88950b724beed3afd3f15a0fa9d9c94a236f85f3b094aa0264

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "27cb9883571a1d1ceea9f111551cb9eeb899d094bc7a01a62fac26ecb29f1abb",
    "cross_cats_sorted": [
      "math.NA"
    ],
    "license": "",
    "primary_cat": "math.OC",
    "submitted_at": "2007-09-20T10:59:42Z",
    "title_canon_sha256": "e9dd020edc75ba96f0a5d907cd0825f4feb79b4db3a1079cdffeef0daee70b5f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0709.3186",
    "kind": "arxiv",
    "version": 3
  }
}