Pith Number

pith:EWA2FCYH

pith:2013:EWA2FCYH55SH236N36YPLAKJKC

not attested not anchored not stored refs pending

An LP-based 3/2-approximation algorithm for the graphic s-t path TSP

Zhihan Gao

arxiv:1304.7055 v1 · 2013-04-26 · 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{EWA2FCYH55SH236N36YPLAKJKC}

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	2026-05-18T03:27:02.680342Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2581a28b07ef647d6fcddfb0f5814950b5373c4be978c01c86c62460ebfc1895

Aliases

arxiv: 1304.7055 · arxiv_version: 1304.7055v1 · doi: 10.48550/arxiv.1304.7055 · pith_short_12: EWA2FCYH55SH · pith_short_16: EWA2FCYH55SH236N · pith_short_8: EWA2FCYH

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/EWA2FCYH55SH236N36YPLAKJKC \
  | 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: 2581a28b07ef647d6fcddfb0f5814950b5373c4be978c01c86c62460ebfc1895

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "64599255d4c3627ecf2572a9fac93f0fd3a923e5d32153995568ca44be7f77fd",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by-nc-sa/3.0/",
    "primary_cat": "cs.DS",
    "submitted_at": "2013-04-26T02:28:22Z",
    "title_canon_sha256": "b99cd45c5f073621238e17f576708f82670513350843c52284abdca9f0ba5f49"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1304.7055",
    "kind": "arxiv",
    "version": 1
  }
}