Pith Number

pith:EYLFQFPB

pith:2016:EYLFQFPB5QZIYSZ36GNOKID6ZF

not attested not anchored not stored refs pending

Counting Answers to Existential Positive Queries: A Complexity Classification

Hubie Chen, Stefan Mengel

arxiv:1601.03240 v2 · 2016-01-13 · cs.DB · cs.CC

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{EYLFQFPB5QZIYSZ36GNOKID6ZF}

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	2026-05-18T01:16:34.699036Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

26165815e1ec328c4b3bf19ae5207ec976b075f8856b5d7c85123d49d15958c2

Aliases

arxiv: 1601.03240 · arxiv_version: 1601.03240v2 · doi: 10.48550/arxiv.1601.03240 · pith_short_12: EYLFQFPB5QZI · pith_short_16: EYLFQFPB5QZIYSZ3 · pith_short_8: EYLFQFPB

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/EYLFQFPB5QZIYSZ36GNOKID6ZF \
  | 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: 26165815e1ec328c4b3bf19ae5207ec976b075f8856b5d7c85123d49d15958c2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "89864dab982cd0b0ebfe4684dda18fd2bf2accd41769946ccd3325c93da3c751",
    "cross_cats_sorted": [
      "cs.CC"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DB",
    "submitted_at": "2016-01-13T13:40:55Z",
    "title_canon_sha256": "a289a7534641127edade8b25863ce379f93c4876a17810c52258d16ca8a1df03"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1601.03240",
    "kind": "arxiv",
    "version": 2
  }
}