Pith Number

pith:WERRP6CT

pith:2011:WERRP6CTTTMQWGGLGF4U5UTQ6J

not attested not anchored not stored refs pending

Feedback vertex set on chordal bipartite graphs

Ching-Hao Liu, Sheung-Hung Poon, Ton Kloks

arxiv:1104.3915 v2 · 2011-04-20 · 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{WERRP6CTTTMQWGGLGF4U5UTQ6J}

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.

Cited by

1 paper in Pith

Sparse induced subgraphs in $P_7$-free graphs of bounded clique number

Receipt and verification

First computed	2026-05-18T03:43:18.881148Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b12317f8539cd90b18cb31794ed270f2743d88da9a970875b50735b068bfb6ae

Aliases

arxiv: 1104.3915 · arxiv_version: 1104.3915v2 · doi: 10.48550/arxiv.1104.3915 · pith_short_12: WERRP6CTTTMQ · pith_short_16: WERRP6CTTTMQWGGL · pith_short_8: WERRP6CT

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/WERRP6CTTTMQWGGLGF4U5UTQ6J \
  | 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: b12317f8539cd90b18cb31794ed270f2743d88da9a970875b50735b068bfb6ae

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "22da56338bd432eb045bdd2a2b8cae8b0db1dc69d82c24cb07f70efe92700d35",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2011-04-20T01:46:42Z",
    "title_canon_sha256": "c9f6b08da5eda43c873eed0c1152b471164abfa38818cd9d2b7736d11ceb1776"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1104.3915",
    "kind": "arxiv",
    "version": 2
  }
}