Pith Number

pith:FE66CN3V

pith:2019:FE66CN3VRPFDPQQKR6DJ4PIYN6

not attested not anchored not stored refs pending

On the Parameterized Complexity of $k$-Edge Colouring

Bernard Ries, Dani\"el Paulusma, Esther Galby, Paloma T. Lima

arxiv:1901.01861 v4 · 2019-01-07 · cs.DM · cs.CC · 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{FE66CN3VRPFDPQQKR6DJ4PIYN6}

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	2026-05-17T23:53:04.223804Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

293de137758bca37c20a8f869e3d186faac2000da159f51da5e09962ff71a8a6

Aliases

arxiv: 1901.01861 · arxiv_version: 1901.01861v4 · doi: 10.48550/arxiv.1901.01861 · pith_short_12: FE66CN3VRPFD · pith_short_16: FE66CN3VRPFDPQQK · pith_short_8: FE66CN3V

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/FE66CN3VRPFDPQQKR6DJ4PIYN6 \
  | 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: 293de137758bca37c20a8f869e3d186faac2000da159f51da5e09962ff71a8a6

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d85468f57e9ecb8ca53baa9e3e64c694e454d58691aafdc932b2b1351fa95a25",
    "cross_cats_sorted": [
      "cs.CC",
      "cs.DS",
      "math.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DM",
    "submitted_at": "2019-01-07T15:02:07Z",
    "title_canon_sha256": "2efa40ab9037498d4f53e510b4bfe28e217ca211a8eb84590100bec639a6782d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1901.01861",
    "kind": "arxiv",
    "version": 4
  }
}