Pith Number

pith:OOV2U3VI

pith:2012:OOV2U3VIYW2BOH4V5JIMGI6VLT

not attested not anchored not stored refs pending

On Approximation Lower Bounds for TSP with Bounded Metrics

Marek Karpinski, Richard Schmied

arxiv:1201.5821 v2 · 2012-01-27 · cs.CC · cs.DM · 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{OOV2U3VIYW2BOH4V5JIMGI6VLT}

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	2026-05-18T03:49:11.785118Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

73abaa6ea8c5b4171f95ea50c323d55cc2914ce5038028c0b15827967122827b

Aliases

arxiv: 1201.5821 · arxiv_version: 1201.5821v2 · doi: 10.48550/arxiv.1201.5821 · pith_short_12: OOV2U3VIYW2B · pith_short_16: OOV2U3VIYW2BOH4V · pith_short_8: OOV2U3VI

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/OOV2U3VIYW2BOH4V5JIMGI6VLT \
  | 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: 73abaa6ea8c5b4171f95ea50c323d55cc2914ce5038028c0b15827967122827b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "18236002b62f17675a9bc9befcf29e68861e85399061d63bbe11b78b8e8afe1e",
    "cross_cats_sorted": [
      "cs.DM",
      "cs.DS"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CC",
    "submitted_at": "2012-01-27T16:31:43Z",
    "title_canon_sha256": "7b0610fa7fad0c3219b46b6acb9079b8c540872d0ef187e560b0b8a6861d13c7"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1201.5821",
    "kind": "arxiv",
    "version": 2
  }
}