Pith Number

pith:ZEMPFRUL

pith:2015:ZEMPFRULTB7SMFTAUW6GUCGNCI

not attested not anchored not stored refs pending

On finding an obstacle embedded in the rough background medium via the enclosure method in the time domain

Masaru Ikehata

arxiv:1504.06925 v3 · 2015-04-27 · 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{ZEMPFRULTB7SMFTAUW6GUCGNCI}

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	2026-05-18T00:22:07.009540Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c918f2c68b987f261660a5bc6a08cd1224e644d192241c638dddc192cde51fbd

Aliases

arxiv: 1504.06925 · arxiv_version: 1504.06925v3 · doi: 10.48550/arxiv.1504.06925 · pith_short_12: ZEMPFRULTB7S · pith_short_16: ZEMPFRULTB7SMFTA · pith_short_8: ZEMPFRUL

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/ZEMPFRULTB7SMFTAUW6GUCGNCI \
  | 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: c918f2c68b987f261660a5bc6a08cd1224e644d192241c638dddc192cde51fbd

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f60df498af56e98f60617987816b5abaa67b533470bfb7321393d21659a54731",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AP",
    "submitted_at": "2015-04-27T04:33:23Z",
    "title_canon_sha256": "9bb85b4b3829d7900387eec69be6d36f48eb06d28193e679c17a8da082f4c3d3"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1504.06925",
    "kind": "arxiv",
    "version": 3
  }
}