Pith Number

pith:NYUB5NOO

pith:2014:NYUB5NOOZH5CTK5XC24ZVROTLL

not attested not anchored not stored refs pending

An optimal algorithm for the weighted backup 2-center problem on a tree

Hung-Lung Wang

arxiv:1409.0098 v3 · 2014-08-30 · 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{NYUB5NOOZH5CTK5XC24ZVROTLL}

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	2026-05-18T01:37:11.416917Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6e281eb5cec9fa29abb716b99ac5d35af15bb9092fe2d6561b4ac32b222ed6b1

Aliases

arxiv: 1409.0098 · arxiv_version: 1409.0098v3 · doi: 10.48550/arxiv.1409.0098 · pith_short_12: NYUB5NOOZH5C · pith_short_16: NYUB5NOOZH5CTK5X · pith_short_8: NYUB5NOO

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/NYUB5NOOZH5CTK5XC24ZVROTLL \
  | 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: 6e281eb5cec9fa29abb716b99ac5d35af15bb9092fe2d6561b4ac32b222ed6b1

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6f3b862cf78ed8fb4a7ce8c1e15dca8eeaca4780373216d590ae1fea277eb246",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DS",
    "submitted_at": "2014-08-30T10:16:48Z",
    "title_canon_sha256": "5fab4c9dedf626f14ec0503e62607a52189a13c40189003c40a2c82e38940466"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1409.0098",
    "kind": "arxiv",
    "version": 3
  }
}