Pith Number

pith:NO3NSSUU

pith:2019:NO3NSSUUCBEGPR5KTSSW3K2R2O

not attested not anchored not stored refs pending

Fixing Nonconvergence of Algebraic Iterative Reconstruction with an Unmatched Backprojector

Michiel E. Hochstenbach, Nicolai Andre Brogaard Riis, Per Christian Hansen, Yiqiu Dong

arxiv:1902.04282 v2 · 2019-02-12 · 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{NO3NSSUUCBEGPR5KTSSW3K2R2O}

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	2026-05-17T23:54:06.615822Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6bb6d94a94104867c7aa9ca56dab51d3a5140e4602a09581bd2b6760074d88ff

Aliases

arxiv: 1902.04282 · arxiv_version: 1902.04282v2 · doi: 10.48550/arxiv.1902.04282 · pith_short_12: NO3NSSUUCBEG · pith_short_16: NO3NSSUUCBEGPR5K · pith_short_8: NO3NSSUU

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/NO3NSSUUCBEGPR5KTSSW3K2R2O \
  | 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: 6bb6d94a94104867c7aa9ca56dab51d3a5140e4602a09581bd2b6760074d88ff

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3332a202bca3711c5cbc53c4f52e1b61d2c60e824aeb579363e5427db8ad8df7",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2019-02-12T08:53:11Z",
    "title_canon_sha256": "9484d111605147ab57b303712de79c1f48701bae9d9594f5bf1e72f5b1c53a61"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1902.04282",
    "kind": "arxiv",
    "version": 2
  }
}