Pith Number

pith:BFVSZGSM

pith:2018:BFVSZGSMWLKAGKTPUTIWXXG5IO

not attested not anchored not stored refs pending

Unique Determination of Sound Speeds for Coupled Systems of Semi-linear Wave Equations

Alden Waters

arxiv:1804.11155 v2 · 2018-04-30 · math.AP

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{BFVSZGSMWLKAGKTPUTIWXXG5IO}

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	2026-05-18T00:01:48.946060Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

096b2c9a4cb2d4032a6fa4d16bdcdd43a82366f804c9d751a3b6500aff9605fe

Aliases

arxiv: 1804.11155 · arxiv_version: 1804.11155v2 · doi: 10.48550/arxiv.1804.11155 · pith_short_12: BFVSZGSMWLKA · pith_short_16: BFVSZGSMWLKAGKTP · pith_short_8: BFVSZGSM

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/BFVSZGSMWLKAGKTPUTIWXXG5IO \
  | 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: 096b2c9a4cb2d4032a6fa4d16bdcdd43a82366f804c9d751a3b6500aff9605fe

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "38a50358f0aea10a16fed954a7ad0615dc17526dc90398035fe9682b74ae045e",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AP",
    "submitted_at": "2018-04-30T12:31:06Z",
    "title_canon_sha256": "44278edf79b8e67e3f4773962e5b1c03a7e5101c46dda0ccc98432571ff695a1"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1804.11155",
    "kind": "arxiv",
    "version": 2
  }
}