Pith Number

pith:Q2MWPPGD

pith:2012:Q2MWPPGDPCY3IQNOWIFMHUGZNL

not attested not anchored not stored refs pending

Directed Subset Feedback Vertex Set is Fixed-Parameter Tractable

D\'aniel Marx, Marek Cygan, MohammadTaghi Hajiaghayi, Rajesh Chitnis

arxiv:1205.1271 v3 · 2012-05-07 · cs.DS · cs.CC

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

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	2026-05-18T02:32:22.782409Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

869967bcc378b1b441aeb20ac3d0d96afc93e854428c2d6c779d12da7fdf277d

Aliases

arxiv: 1205.1271 · arxiv_version: 1205.1271v3 · doi: 10.48550/arxiv.1205.1271 · pith_short_12: Q2MWPPGDPCY3 · pith_short_16: Q2MWPPGDPCY3IQNO · pith_short_8: Q2MWPPGD

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/Q2MWPPGDPCY3IQNOWIFMHUGZNL \
  | 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: 869967bcc378b1b441aeb20ac3d0d96afc93e854428c2d6c779d12da7fdf277d

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b05f5d970dbfa70200fa635df11b23883fb3eef45e4690e510724fcec1f3a85e",
    "cross_cats_sorted": [
      "cs.CC"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DS",
    "submitted_at": "2012-05-07T02:59:39Z",
    "title_canon_sha256": "eda401fefb6da14cf9f342d79f8c9b7886cf963f9aede32884d625e47cc65075"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1205.1271",
    "kind": "arxiv",
    "version": 3
  }
}