Pith Number

pith:DMWFKYQ4

pith:2010:DMWFKYQ4NNMGUXNI2GAZ3ETJRN

not attested not anchored not stored refs pending

On the (non-)existence of polynomial kernels for Pl-free edge modification problems

Anthony Perez, Christophe Paul, Sylvain Guillemot

arxiv:1007.4011 v1 · 2010-07-22 · 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{DMWFKYQ4NNMGUXNI2GAZ3ETJRN}

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	2026-05-18T02:06:11.357255Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1b2c55621c6b586a5da8d1819d92698b5d0675ed3e559ec3e6605f6fddf3ded7

Aliases

arxiv: 1007.4011 · arxiv_version: 1007.4011v1 · doi: 10.48550/arxiv.1007.4011 · pith_short_12: DMWFKYQ4NNMG · pith_short_16: DMWFKYQ4NNMGUXNI · pith_short_8: DMWFKYQ4

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/DMWFKYQ4NNMGUXNI2GAZ3ETJRN \
  | 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: 1b2c55621c6b586a5da8d1819d92698b5d0675ed3e559ec3e6605f6fddf3ded7

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5830e0749f6c73930c1f40e7228db7e0fda997b4ab7830d500adc00909afbcd4",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DS",
    "submitted_at": "2010-07-22T21:14:40Z",
    "title_canon_sha256": "7ea942543d5756b547cf8ba5b62696b22e62cad34fe4a2356c57607d02ec8f92"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1007.4011",
    "kind": "arxiv",
    "version": 1
  }
}