Pith Number

pith:OUE4MOTZ

pith:2005:OUE4MOTZFBH66TAXJWFNEFLZ56

not attested not anchored not stored refs pending

The Hurwitz Equivalence Problem is Undecidable

E. Liberman, M. Teicher

arxiv:math/0511153 v2 · 2005-11-07 · math.LO · math.AG

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{OUE4MOTZFBH66TAXJWFNEFLZ56}

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	2026-07-04T14:51:39.848818Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7509c63a79284fef4c174d8ad21579ef931ba568342b006fac68d7534d12efeb

Aliases

arxiv: math/0511153 · arxiv_version: math/0511153v2 · doi: 10.48550/arxiv.math/0511153 · pith_short_12: OUE4MOTZFBH6 · pith_short_16: OUE4MOTZFBH66TAX · pith_short_8: OUE4MOTZ

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/OUE4MOTZFBH66TAXJWFNEFLZ56 \
  | 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: 7509c63a79284fef4c174d8ad21579ef931ba568342b006fac68d7534d12efeb

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9aef37243ec8351e551bf3858edf7c6098f9378b37b4589351ff4b18bcce2b86",
    "cross_cats_sorted": [
      "math.AG"
    ],
    "license": "",
    "primary_cat": "math.LO",
    "submitted_at": "2005-11-07T07:11:44Z",
    "title_canon_sha256": "b5d538ef86fbd0d997a34537942a27128ebd9fb676719caecc755c5e7ecb26e4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "math/0511153",
    "kind": "arxiv",
    "version": 2
  }
}