Pith Number

pith:YCQ7MYKV

pith:2019:YCQ7MYKV5FU6MUOG2X2E4ZQJTA

not attested not anchored not stored refs pending

Undecidability of $D_{<:}$ and Its Decidable Fragments

Jason Hu, Ond\v{r}ej Lhot\'ak

arxiv:1908.05294 v1 · 2019-08-14 · cs.PL

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{YCQ7MYKV5FU6MUOG2X2E4ZQJTA}

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	2026-07-05T01:02:43.727010Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c0a1f66155e969e651c6d5f44e66099818005a73c961bbd0944263c67bb91f8b

Aliases

arxiv: 1908.05294 · arxiv_version: 1908.05294v1 · doi: 10.48550/arxiv.1908.05294 · pith_short_12: YCQ7MYKV5FU6 · pith_short_16: YCQ7MYKV5FU6MUOG · pith_short_8: YCQ7MYKV

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/YCQ7MYKV5FU6MUOG2X2E4ZQJTA \
  | 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: c0a1f66155e969e651c6d5f44e66099818005a73c961bbd0944263c67bb91f8b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "bb35ec2a0d811c775c19818907739150694c4346c4f285112f8cf4eef2d985cb",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.PL",
    "submitted_at": "2019-08-14T18:15:47Z",
    "title_canon_sha256": "9896577bb2308c47dcbc6e74ece69d6e9d2a5c0b952d4f300fe08c17e726c29b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1908.05294",
    "kind": "arxiv",
    "version": 1
  }
}