Pith Number

pith:WWXZOBSU

pith:2019:WWXZOBSU4X7SO5GT7W2F622BQJ

not attested not anchored not stored refs pending

Variable Order, Directional H2-Matrices for Helmholtz Problems with Complex Frequency

Maria Lopez-Fernandez, Stefan Sauter, Steffen B\"orm

arxiv:1903.02803 v1 · 2019-03-07 · 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{WWXZOBSU4X7SO5GT7W2F622BQJ}

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	2026-05-17T23:39:30.408966Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b5af970654e5ff2774d3fdb45f6b41825640ed5aeb92b67b1bda086ffc08915f

Aliases

arxiv: 1903.02803 · arxiv_version: 1903.02803v1 · doi: 10.48550/arxiv.1903.02803 · pith_short_12: WWXZOBSU4X7S · pith_short_16: WWXZOBSU4X7SO5GT · pith_short_8: WWXZOBSU

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/WWXZOBSU4X7SO5GT7W2F622BQJ \
  | 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: b5af970654e5ff2774d3fdb45f6b41825640ed5aeb92b67b1bda086ffc08915f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9b6784d0e7f8facdd8d515949d13fde8565035343c02d46d85bf179f92c8ff20",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2019-03-07T10:03:04Z",
    "title_canon_sha256": "15c65587d84f8f58495da22855a198320e473d0791a79a42a54585fbbff562ac"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1903.02803",
    "kind": "arxiv",
    "version": 1
  }
}