Pith Number

pith:OIWWEZYQ

pith:2015:OIWWEZYQM53OQMR2ZIYJLJFCEV

not attested not anchored not stored refs pending

Near-optimal perfectly matched layers for indefinite Helmholtz problems

Leonid Knizhnerman, Stefan G\"uttel, Vladimir Druskin

arxiv:1507.06265 v1 · 2015-07-22 · math.NA · math-ph · math.MP

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{OIWWEZYQM53OQMR2ZIYJLJFCEV}

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	2026-05-18T01:36:26.277397Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

722d6267106776e8323aca3095a4a22575f09f60d52113aabf38cde9e42c4bfd

Aliases

arxiv: 1507.06265 · arxiv_version: 1507.06265v1 · doi: 10.48550/arxiv.1507.06265 · pith_short_12: OIWWEZYQM53O · pith_short_16: OIWWEZYQM53OQMR2 · pith_short_8: OIWWEZYQ

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/OIWWEZYQM53OQMR2ZIYJLJFCEV \
  | 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: 722d6267106776e8323aca3095a4a22575f09f60d52113aabf38cde9e42c4bfd

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "37a44ba4e8f6086143e8259acb189c7eb8fbcd94d74c43836dc28a49f99dc18a",
    "cross_cats_sorted": [
      "math-ph",
      "math.MP"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2015-07-22T17:37:01Z",
    "title_canon_sha256": "6cd5fa10e8c5f689c3de6943d19375f09745bfbfbc5a1a8f6e6806f2f63a1c4f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1507.06265",
    "kind": "arxiv",
    "version": 1
  }
}