Pith Number

pith:NWID6MIM

pith:2011:NWID6MIMMX2FMEHMMXUH6XU6IS

not attested not anchored not stored refs pending

Matrix probing: a randomized preconditioner for the wave-equation Hessian

Henri Calandra, Jiawei Chiu, Laurent Demanet, Nicolas Boumal, Pierre-David L\'etourneau, Stanley Snelson

arxiv:1101.3615 v1 · 2011-01-19 · math.NA · physics.geo-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{NWID6MIMMX2FMEHMMXUH6XU6IS}

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	2026-05-18T02:22:51.487170Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6d903f310c65f45610ec65e87f5e9e449539dfd29c8e82b0cb7f7239fd155c8c

Aliases

arxiv: 1101.3615 · arxiv_version: 1101.3615v1 · doi: 10.48550/arxiv.1101.3615 · pith_short_12: NWID6MIMMX2F · pith_short_16: NWID6MIMMX2FMEHM · pith_short_8: NWID6MIM

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/NWID6MIMMX2FMEHMMXUH6XU6IS \
  | 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: 6d903f310c65f45610ec65e87f5e9e449539dfd29c8e82b0cb7f7239fd155c8c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "1765c00813dbb542c9f2483ce40b23d6eb66aea397d3ccb51071edc2cc676bbb",
    "cross_cats_sorted": [
      "physics.geo-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2011-01-19T05:06:44Z",
    "title_canon_sha256": "bfd61d664935de72d3c1283bd087e05fce98ddfe108a0b5edd0fb9545e0d600b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1101.3615",
    "kind": "arxiv",
    "version": 1
  }
}