Pith Number

pith:YX5ZNMZP

pith:2009:YX5ZNMZPBTKW3YZ6ZSDHRDCYS4

not attested not anchored not stored refs pending

Thermoacoustic tomography with variable sound speed

Gunther Uhlmann, Plamen Stefanov

arxiv:0902.1973 v2 · 2009-02-11 · math.AP · 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{YX5ZNMZPBTKW3YZ6ZSDHRDCYS4}

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	2026-05-18T04:41:14.266858Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c5fb96b32f0cd56de33ecc86788c58972419d00b8244bde080e18c5b3bc54a9f

Aliases

arxiv: 0902.1973 · arxiv_version: 0902.1973v2 · doi: 10.48550/arxiv.0902.1973 · pith_short_12: YX5ZNMZPBTKW · pith_short_16: YX5ZNMZPBTKW3YZ6 · pith_short_8: YX5ZNMZP

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/YX5ZNMZPBTKW3YZ6ZSDHRDCYS4 \
  | 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: c5fb96b32f0cd56de33ecc86788c58972419d00b8244bde080e18c5b3bc54a9f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "008d5a1b86ae8c7c1774fe4e951084cadd5004b492a3d1f3c973e8738e92b40a",
    "cross_cats_sorted": [
      "math-ph",
      "math.MP"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AP",
    "submitted_at": "2009-02-11T20:57:28Z",
    "title_canon_sha256": "ff93e86005f75a71ae67201f152fa82441cf16c2e4f1ed1ce9cb15a05ebc7f02"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0902.1973",
    "kind": "arxiv",
    "version": 2
  }
}