Pith Number

pith:IOSUG5L4

pith:2008:IOSUG5L4RJHHHSWSYIHC3BBY6R

not attested not anchored not stored refs pending

Identifying of the refractive index for the acoustic equation at fixed frequency

Abdessatar Khelifi, Anton Sushchenko, Christian Daveau

arxiv:0804.2644 v1 · 2008-04-16 · 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{IOSUG5L4RJHHHSWSYIHC3BBY6R}

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	2026-05-18T04:28:28.482940Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

43a543757c8a4e73cad2c20e2d8438f4673ae521a3406f4de693fb1b785e6b08

Aliases

arxiv: 0804.2644 · arxiv_version: 0804.2644v1 · doi: 10.48550/arxiv.0804.2644 · pith_short_12: IOSUG5L4RJHH · pith_short_16: IOSUG5L4RJHHHSWS · pith_short_8: IOSUG5L4

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/IOSUG5L4RJHHHSWSYIHC3BBY6R \
  | 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: 43a543757c8a4e73cad2c20e2d8438f4673ae521a3406f4de693fb1b785e6b08

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7ed7ac8d7ac99a5878f58bed2f473521e0ccd90ede2a99fda35a971cf34e047c",
    "cross_cats_sorted": [
      "math.MP"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math-ph",
    "submitted_at": "2008-04-16T16:50:35Z",
    "title_canon_sha256": "0d3e9d958a6295f5e28e5b858cb4e81570fbb2f9e8405eccd9d47ce596e4446b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0804.2644",
    "kind": "arxiv",
    "version": 1
  }
}