Pith Number

pith:RL4CFHII

pith:2021:RL4CFHIIZHNSS4IISIW44U4O57

not attested not anchored not stored refs pending

Frequency-robust preconditioning of boundary integral equations for acoustic transmission

Elwin van 't Wout, Nader Saffari, Pierre G\'elat, Seyyed R. Haqshenas, Timo Betcke

arxiv:2104.04609 v2 · 2021-04-09 · math.NA · cs.NA · physics.med-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{RL4CFHIIZHNSS4IISIW44U4O57}

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	2026-07-05T04:15:08.633973Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8af8229d08c9db297108922dce538eefebfc056547885bf316400b8dbe77eb62

Aliases

arxiv: 2104.04609 · arxiv_version: 2104.04609v2 · doi: 10.48550/arxiv.2104.04609 · pith_short_12: RL4CFHIIZHNS · pith_short_16: RL4CFHIIZHNSS4II · pith_short_8: RL4CFHII

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/RL4CFHIIZHNSS4IISIW44U4O57 \
  | 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: 8af8229d08c9db297108922dce538eefebfc056547885bf316400b8dbe77eb62

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6a61e87bbd1fe0f98ca3fbda392c2462ceb07c59368d86fe27b8b09ec4e464ed",
    "cross_cats_sorted": [
      "cs.NA",
      "physics.med-ph"
    ],
    "license": "http://creativecommons.org/licenses/by-nc-nd/4.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2021-04-09T21:22:38Z",
    "title_canon_sha256": "451be16a2fc50a8d746bb086d90997240de796278a8cd0cd08b3b18b0639d74e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2104.04609",
    "kind": "arxiv",
    "version": 2
  }
}