Pith Number

pith:HKWD6GU3

pith:2015:HKWD6GU3Y45DWTCJ2UEJZWEO6W

not attested not anchored not stored refs pending

Characterization theorems for PDL and FO(TC)

Facundo Carreiro

arxiv:1501.02607 v2 · 2015-01-12 · cs.LO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{HKWD6GU3Y45DWTCJ2UEJZWEO6W}

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	2026-05-18T01:37:47.319367Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3aac3f1a9bc73a3b4c49d5089cd88ef5b6ec89d303d66d0e99f2597ad5af8ac2

Aliases

arxiv: 1501.02607 · arxiv_version: 1501.02607v2 · doi: 10.48550/arxiv.1501.02607 · pith_short_12: HKWD6GU3Y45D · pith_short_16: HKWD6GU3Y45DWTCJ · pith_short_8: HKWD6GU3

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/HKWD6GU3Y45DWTCJ2UEJZWEO6W \
  | 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: 3aac3f1a9bc73a3b4c49d5089cd88ef5b6ec89d303d66d0e99f2597ad5af8ac2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "38a1e51c4637aabd07e4c954c683a03da26c09fd292b5d145ac2c2b9a5bf2722",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.LO",
    "submitted_at": "2015-01-12T11:36:21Z",
    "title_canon_sha256": "008f2ec5e17d5f2f881b434d86616238c4231377066a9b0167b321fe0404a6e9"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1501.02607",
    "kind": "arxiv",
    "version": 2
  }
}