Pith Number

pith:Z7PJIQ6O

pith:2009:Z7PJIQ6OHEFFAYEJ7UWTGF5JFN

not attested not anchored not stored refs pending

Rotation Distance is Fixed-Parameter Tractable

Katherine St. John, Sean Cleary

arxiv:0903.0197 v1 · 2009-03-02 · 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{Z7PJIQ6OHEFFAYEJ7UWTGF5JFN}

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	2026-05-18T00:20:54.322306Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

cfde9443ce390a506089fd2d3317a92b6555cebbcd1cb40d05755c34e73168e1

Aliases

arxiv: 0903.0197 · arxiv_version: 0903.0197v1 · doi: 10.48550/arxiv.0903.0197 · pith_short_12: Z7PJIQ6OHEFF · pith_short_16: Z7PJIQ6OHEFFAYEJ · pith_short_8: Z7PJIQ6O

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/Z7PJIQ6OHEFFAYEJ7UWTGF5JFN \
  | 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: cfde9443ce390a506089fd2d3317a92b6555cebbcd1cb40d05755c34e73168e1

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "4f781b64c7692900f7c07cc085b5a8a32b58092cd2b4be1eb7f87ba06887d2b0",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DS",
    "submitted_at": "2009-03-02T01:36:50Z",
    "title_canon_sha256": "3ea2e4df2805c87758294b329a054894bea5fd93fd7ae430b942be221bf77dc7"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0903.0197",
    "kind": "arxiv",
    "version": 1
  }
}