Pith Number

pith:A6RV3U6M

pith:2019:A6RV3U6MYT4K3JBZ6EBRWK6XYV

not attested not anchored not stored refs pending

Linearly-growing Reductions of Karp's 21 NP-complete Problems

Jerzy A Filar, Michael Haythorpe, Richard Taylor

arxiv:1902.10349 v1 · 2019-02-27 · math.CO · cs.CC · cs.DS

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{A6RV3U6MYT4K3JBZ6EBRWK6XYV}

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	2026-05-17T23:52:31.107632Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

07a35dd3ccc4f8ada439f1031b2bd7c57f4c4eadb2e5a20e1291c2d4c720d2e5

Aliases

arxiv: 1902.10349 · arxiv_version: 1902.10349v1 · doi: 10.48550/arxiv.1902.10349 · pith_short_12: A6RV3U6MYT4K · pith_short_16: A6RV3U6MYT4K3JBZ · pith_short_8: A6RV3U6M

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/A6RV3U6MYT4K3JBZ6EBRWK6XYV \
  | 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: 07a35dd3ccc4f8ada439f1031b2bd7c57f4c4eadb2e5a20e1291c2d4c720d2e5

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "649871771e46f668940cbe5e49a4eca81af9a994a5776c6a33b747d082314735",
    "cross_cats_sorted": [
      "cs.CC",
      "cs.DS"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2019-02-27T06:17:56Z",
    "title_canon_sha256": "669f42fa36f3fdf561d5e3e798930d5703128562c3394fb3783d88665117f417"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1902.10349",
    "kind": "arxiv",
    "version": 1
  }
}