Pith Number

pith:QQDIBOQP

pith:2017:QQDIBOQP46RMY3APNZJTJZFY4R

not attested not anchored not stored refs pending

Total Variation Superiorized Conjugate Gradient Method for Image Reconstruction

Chuan Lin, Gabor T. Herman, Marcelo V. W. Zibetti

arxiv:1709.04912 v1 · 2017-09-14 · 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{QQDIBOQP46RMY3APNZJTJZFY4R}

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	2026-05-18T00:23:33.469784Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

840680ba0fe7a2cc6c0f6e5334e4b8e46e7092f50163b3afdbc06b9121f5eef8

Aliases

arxiv: 1709.04912 · arxiv_version: 1709.04912v1 · doi: 10.48550/arxiv.1709.04912 · pith_short_12: QQDIBOQP46RM · pith_short_16: QQDIBOQP46RMY3AP · pith_short_8: QQDIBOQP

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/QQDIBOQP46RMY3APNZJTJZFY4R \
  | 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: 840680ba0fe7a2cc6c0f6e5334e4b8e46e7092f50163b3afdbc06b9121f5eef8

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e43fe1105bc232328df48baca8e99c6e1d4fef2e48dfd4c1f7cd9ccfcc90cdaa",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.OC",
    "submitted_at": "2017-09-14T17:57:35Z",
    "title_canon_sha256": "b80204fb407c4e321bdf682c313a3767c38bc549235295618135c03bf636da63"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1709.04912",
    "kind": "arxiv",
    "version": 1
  }
}