Pith Number

pith:R2ZJNZXX

pith:2019:R2ZJNZXXOQEUQLHYZDT43IVF5T

not attested not anchored not stored refs pending

A Partial Differential Equation Obstacle Problem for the Level Set Approach to Visibility

Adam Oberman, Tiago Salvador

arxiv:1908.00578 v1 · 2019-08-01 · math.AP · cs.NA · math.NA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{R2ZJNZXXOQEUQLHYZDT43IVF5T}

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	2026-07-04T23:51:06.883218Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8eb296e6f77409482cf8c8e7cda2a5ecef194636c951b0130aed600f51671746

Aliases

arxiv: 1908.00578 · arxiv_version: 1908.00578v1 · doi: 10.48550/arxiv.1908.00578 · pith_short_12: R2ZJNZXXOQEU · pith_short_16: R2ZJNZXXOQEUQLHY · pith_short_8: R2ZJNZXX

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/R2ZJNZXXOQEUQLHYZDT43IVF5T \
  | 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: 8eb296e6f77409482cf8c8e7cda2a5ecef194636c951b0130aed600f51671746

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "8bf05228325498d0499d28138d6cee302ec250c730204fc63395bca02c6dbd26",
    "cross_cats_sorted": [
      "cs.NA",
      "math.NA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AP",
    "submitted_at": "2019-08-01T18:53:07Z",
    "title_canon_sha256": "bfc5cea94fcc0817ef2526bc3a1568d50c7f219b668d1987b2e1462986ec1c25"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1908.00578",
    "kind": "arxiv",
    "version": 1
  }
}