Pith Number

pith:HPJMIFIL

pith:2016:HPJMIFILLLKBXGYHRBS55TCGC2

not attested not anchored not stored refs pending

An example of a Fra\"iss\'e class without a Kat\v{e}tov functor

Jan Greb\'ik

arxiv:1604.00358 v1 · 2016-04-01 · math.LO · math.CT

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{HPJMIFILLLKBXGYHRBS55TCGC2}

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	2026-05-18T01:17:53.872949Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3bd2c4150b5ad41b9b078865decc46168b26babe6a916c5407394f05e50a0c82

Aliases

arxiv: 1604.00358 · arxiv_version: 1604.00358v1 · doi: 10.48550/arxiv.1604.00358 · pith_short_12: HPJMIFILLLKB · pith_short_16: HPJMIFILLLKBXGYH · pith_short_8: HPJMIFIL

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/HPJMIFILLLKBXGYHRBS55TCGC2 \
  | 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: 3bd2c4150b5ad41b9b078865decc46168b26babe6a916c5407394f05e50a0c82

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5dd0cb77e4e61cbd5d0025da86e92a10788c92415a4b70e173c7ae5ae6f92d24",
    "cross_cats_sorted": [
      "math.CT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.LO",
    "submitted_at": "2016-04-01T18:53:54Z",
    "title_canon_sha256": "6b7a68fb650cb1583c39316f8f0901b11eeffc69be1af2427b17e4718926097d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1604.00358",
    "kind": "arxiv",
    "version": 1
  }
}