Pith Number

pith:H3QRLMFY

pith:2019:H3QRLMFYOGDY5HXULQDWBEENRF

not attested not anchored not stored refs pending

Approximating Orthogonal Matrices with Effective Givens Factorization

Joan Bruna, Thomas Frerix

arxiv:1905.05796 v1 · 2019-05-14 · 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{H3QRLMFYOGDY5HXULQDWBEENRF}

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	2026-05-17T23:46:08.518903Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3ee115b0b871878e9ef45c0760908d896db62991c5605f31e1a350e7d867ccee

Aliases

arxiv: 1905.05796 · arxiv_version: 1905.05796v1 · doi: 10.48550/arxiv.1905.05796 · pith_short_12: H3QRLMFYOGDY · pith_short_16: H3QRLMFYOGDY5HXU · pith_short_8: H3QRLMFY

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/H3QRLMFYOGDY5HXULQDWBEENRF \
  | 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: 3ee115b0b871878e9ef45c0760908d896db62991c5605f31e1a350e7d867ccee

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ffcac259bcf3c731b56da713168a4d40b9cb54ce972b8ab8eee741e25f3331f4",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.OC",
    "submitted_at": "2019-05-14T18:55:48Z",
    "title_canon_sha256": "e0477473aad4f825ca2d3e48a8b1f7f6967b457ba5525e43a7bdbda8aa3b0f49"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1905.05796",
    "kind": "arxiv",
    "version": 1
  }
}