Pith Number

pith:42IAYDRH

pith:2019:42IAYDRHIAFJPBBIMRMMIBSJ64

not attested not anchored not stored refs pending

On the optimal error bound for the first step in the method of cyclic alternating projections

Ivan Feshchenko

arxiv:1908.00531 v1 · 2019-08-01 · math.FA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{42IAYDRHIAFJPBBIMRMMIBSJ64}

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	2026-07-04T23:51:01.507018Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e6900c0e27400a9784286458c40649f728ba64a8f80a051d6d8f0b7a6affa812

Aliases

arxiv: 1908.00531 · arxiv_version: 1908.00531v1 · doi: 10.48550/arxiv.1908.00531 · pith_short_12: 42IAYDRHIAFJ · pith_short_16: 42IAYDRHIAFJPBBI · pith_short_8: 42IAYDRH

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/42IAYDRHIAFJPBBIMRMMIBSJ64 \
  | 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: e6900c0e27400a9784286458c40649f728ba64a8f80a051d6d8f0b7a6affa812

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "261874f53d2733840329960deddc72e2f37d8a3130aa37810f0a6866b2d1fe8e",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.FA",
    "submitted_at": "2019-08-01T17:45:54Z",
    "title_canon_sha256": "32c3be52a2e0a314a9d93a46ed3457d16d9a91a4b935d82b5e5e3949c737a20a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1908.00531",
    "kind": "arxiv",
    "version": 1
  }
}