Pith Number

pith:UZTBZWZ7

pith:2020:UZTBZWZ7VVDWGQ6E3CMME23OZ2

not attested not anchored not stored refs pending

Germ\'an Ancochea's work on projectivities, harmonicity preservers and semi-homomorphisms

Hans Havlicek

arxiv:2004.00886 v2 · 2020-04-02 · math.HO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{UZTBZWZ7VVDWGQ6E3CMME23OZ2}

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	2026-06-24T01:14:17.680169Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a6661cdb3fad476343c4d898c26b6ece9e515d2c90783891671213012b98ecf5

Aliases

arxiv: 2004.00886 · arxiv_version: 2004.00886v2 · doi: 10.48550/arxiv.2004.00886 · pith_short_12: UZTBZWZ7VVDW · pith_short_16: UZTBZWZ7VVDWGQ6E · pith_short_8: UZTBZWZ7

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/UZTBZWZ7VVDWGQ6E3CMME23OZ2 \
  | 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: a6661cdb3fad476343c4d898c26b6ece9e515d2c90783891671213012b98ecf5

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9963d70575e1bbb9c46cbb42e149e69281f71015769acc22da53ddbccdf3cac2",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.HO",
    "submitted_at": "2020-04-02T09:03:57Z",
    "title_canon_sha256": "0454cf3c94c63d5ab54f30883265dceb9027a05528a003f2886c8db49bd1440f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2004.00886",
    "kind": "arxiv",
    "version": 2
  }
}