Pith Number

pith:SD66A4WR

pith:2019:SD66A4WRYW5Z2NDE4DDVF2NOWS

not attested not anchored not stored refs pending

Finding big matchings in planar graphs quickly

Therese Biedl

arxiv:1902.07812 v1 · 2019-02-20 · 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{SD66A4WRYW5Z2NDE4DDVF2NOWS}

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	2026-05-17T23:53:03.822123Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

90fde072d1c5bb9d3464e0c752e9aeb4ac5f26c66d768543383813f12230c959

Aliases

arxiv: 1902.07812 · arxiv_version: 1902.07812v1 · doi: 10.48550/arxiv.1902.07812 · pith_short_12: SD66A4WRYW5Z · pith_short_16: SD66A4WRYW5Z2NDE · pith_short_8: SD66A4WR

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/SD66A4WRYW5Z2NDE4DDVF2NOWS \
  | 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: 90fde072d1c5bb9d3464e0c752e9aeb4ac5f26c66d768543383813f12230c959

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5cc189250067c33600b370d5a9ca67dc4aa1a500d674a44889a42970f3e988cc",
    "cross_cats_sorted": [
      "math.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DS",
    "submitted_at": "2019-02-20T23:39:40Z",
    "title_canon_sha256": "53e150bcbdc599f5d4ca04b9fa8431b407e31f5a2e1729a20f1a8cd5267d0484"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1902.07812",
    "kind": "arxiv",
    "version": 1
  }
}