Pith Number

pith:UCZJAQGR

pith:2019:UCZJAQGRIIFWIESH5VE7EJLPPZ

not attested not anchored not stored refs pending

On Reachability Problems for Low-Dimensional Matrix Semigroups

James Worrell, Jo\"el Ouaknine, Pavel Semukhin, Thomas Colcombet

arxiv:1902.09597 v3 · 2019-02-25 · cs.CC · cs.FL

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{UCZJAQGRIIFWIESH5VE7EJLPPZ}

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	2026-05-17T23:47:35.737021Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a0b29040d1420b641247ed49f2256f7e4d8f5fb3c96cca3bc9c0f6e86ae5b891

Aliases

arxiv: 1902.09597 · arxiv_version: 1902.09597v3 · doi: 10.48550/arxiv.1902.09597 · pith_short_12: UCZJAQGRIIFW · pith_short_16: UCZJAQGRIIFWIESH · pith_short_8: UCZJAQGR

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/UCZJAQGRIIFWIESH5VE7EJLPPZ \
  | 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: a0b29040d1420b641247ed49f2256f7e4d8f5fb3c96cca3bc9c0f6e86ae5b891

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "20874ffeb963f7ac09b9984fee76a0dcdeb477c8723f208eb41226d6b18b392d",
    "cross_cats_sorted": [
      "cs.FL"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CC",
    "submitted_at": "2019-02-25T20:18:13Z",
    "title_canon_sha256": "79aa4ecc9086695c841c1c0bd59b809e81eabf20a7fe91a61b9db267085049e8"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1902.09597",
    "kind": "arxiv",
    "version": 3
  }
}