Pith Number

pith:QHOZFT5D

pith:2025:QHOZFT5DIK7XQIYKBES3KX5GLV

not attested not anchored not stored refs pending

Relational Algebras for Subset Selection and Optimisation

David Robert Pratten, Fahimeh Ramezani, Luke Mathieson

arxiv:2509.06439 v1 · 2025-09-08 · cs.DB · cs.DM · cs.MS

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{QHOZFT5DIK7XQIYKBES3KX5GLV}

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	2026-07-05T12:06:35.813947Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

81dd92cfa342bf78230a0925b55fa65d582f48ba58a686a9b4fff245a0689457

Aliases

arxiv: 2509.06439 · arxiv_version: 2509.06439v1 · doi: 10.48550/arxiv.2509.06439 · pith_short_12: QHOZFT5DIK7X · pith_short_16: QHOZFT5DIK7XQIYK · pith_short_8: QHOZFT5D

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/QHOZFT5DIK7XQIYKBES3KX5GLV \
  | 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: 81dd92cfa342bf78230a0925b55fa65d582f48ba58a686a9b4fff245a0689457

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5e2298d8383725f7f319c09496ae4185290a961190098134a4d2a0869a40fccc",
    "cross_cats_sorted": [
      "cs.DM",
      "cs.MS"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DB",
    "submitted_at": "2025-09-08T08:35:46Z",
    "title_canon_sha256": "f3a5a656f12fe856282593adb7a60bca2ff82aabc19e7dc96720708af613706b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2509.06439",
    "kind": "arxiv",
    "version": 1
  }
}