Pith Number

pith:KWMGUMED

pith:2018:KWMGUMEDNX5ZS4YFH7DS5ZSGMH

not attested not anchored not stored refs pending

Undecidable word problem in subshift automorphism groups

Emmanuel Jeandel (CARTE), Jarkko Kari, Pascal Vanier (LACL), Pierre Guillon (I2M)

arxiv:1808.09194 v2 · 2018-08-28 · cs.CC · math.DS · math.GR

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{KWMGUMEDNX5ZS4YFH7DS5ZSGMH}

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	2026-05-18T00:06:36.619389Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

55986a30836dfb9973053fc72ee64661ff8b294128b5182b443dbd5321138cea

Aliases

arxiv: 1808.09194 · arxiv_version: 1808.09194v2 · doi: 10.48550/arxiv.1808.09194 · pith_short_12: KWMGUMEDNX5Z · pith_short_16: KWMGUMEDNX5ZS4YF · pith_short_8: KWMGUMED

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/KWMGUMEDNX5ZS4YFH7DS5ZSGMH \
  | 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: 55986a30836dfb9973053fc72ee64661ff8b294128b5182b443dbd5321138cea

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c5710c61f109e0619a0661e4397057cbc3f648fa8076b0a8f35f02841ee1c83a",
    "cross_cats_sorted": [
      "math.DS",
      "math.GR"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CC",
    "submitted_at": "2018-08-28T09:31:41Z",
    "title_canon_sha256": "763a5c12e99eef461ce4bb77573bf4d640e8d0fadf865fd342a5c8c844a311f2"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1808.09194",
    "kind": "arxiv",
    "version": 2
  }
}