Pith Number

pith:4M6OQ4ZE

pith:2018:4M6OQ4ZEWBSRXWHDOSBRAUP5K3

not attested not anchored not stored refs pending

Hardness, Approximability, and Fixed-Parameter Tractability of the Clustered Shortest-Path Tree Problem

Daniele Frigioni, Guido Proietti, Luca Forlizzi, Mattia D'Emidio, Stefano Leucci

arxiv:1801.10416 v1 · 2018-01-31 · cs.DS · cs.CC · cs.NI

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{4M6OQ4ZEWBSRXWHDOSBRAUP5K3}

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	2026-05-18T00:24:40.892770Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e33ce87324b0651bd8e374831051fd56d2ce2dcf05b720d2efea93513fe54195

Aliases

arxiv: 1801.10416 · arxiv_version: 1801.10416v1 · doi: 10.48550/arxiv.1801.10416 · pith_short_12: 4M6OQ4ZEWBSR · pith_short_16: 4M6OQ4ZEWBSRXWHD · pith_short_8: 4M6OQ4ZE

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/4M6OQ4ZEWBSRXWHDOSBRAUP5K3 \
  | 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: e33ce87324b0651bd8e374831051fd56d2ce2dcf05b720d2efea93513fe54195

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "27304c3b0c2aebae95317742fb7824c85d614abe598c7b8be0c42124fa5bc920",
    "cross_cats_sorted": [
      "cs.CC",
      "cs.NI"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "cs.DS",
    "submitted_at": "2018-01-31T12:02:04Z",
    "title_canon_sha256": "99bfaedf9d84ba9b1d57b3ea682ef64c59634e4fa7463698e9ba243823287862"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1801.10416",
    "kind": "arxiv",
    "version": 1
  }
}