Pith Number

pith:RUD7WSNN

pith:2019:RUD7WSNNCHTWJPIF5NB2X5UTK6

not attested not anchored not stored refs pending

Testing isomorphism of circular-arc graphs -- Hsu's approach revisited

Tomasz Krawczyk

arxiv:1904.04501 v3 · 2019-04-09 · cs.DS · math.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{RUD7WSNNCHTWJPIF5NB2X5UTK6}

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	2026-05-17T23:40:43.312704Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8d07fb49ad11e764bd05eb43abf69357b55fa9b914c4ae611c3707de283a96a0

Aliases

arxiv: 1904.04501 · arxiv_version: 1904.04501v3 · doi: 10.48550/arxiv.1904.04501 · pith_short_12: RUD7WSNNCHTW · pith_short_16: RUD7WSNNCHTWJPIF · pith_short_8: RUD7WSNN

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/RUD7WSNNCHTWJPIF5NB2X5UTK6 \
  | 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: 8d07fb49ad11e764bd05eb43abf69357b55fa9b914c4ae611c3707de283a96a0

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "867d2c4ef4a69719a2a07093603049caac7edf696722f161606eb85476fcb1af",
    "cross_cats_sorted": [
      "math.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DS",
    "submitted_at": "2019-04-09T07:38:12Z",
    "title_canon_sha256": "8a798fa6fd0497480fd008a0a918b00ddf9baff02bc8eb29eb76296abffb6a04"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1904.04501",
    "kind": "arxiv",
    "version": 3
  }
}