Pith Number

pith:PKUIFJOC

pith:2012:PKUIFJOCJGNY7JZLBTLSYOVJJ5

not attested not anchored not stored refs pending

The classifying space of an inverse semigroup

Ganna Kudryavtseva, Mark V Lawson

arxiv:1210.4421 v1 · 2012-10-16 · 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{PKUIFJOCJGNY7JZLBTLSYOVJJ5}

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	2026-05-18T03:43:06.022056Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7aa882a5c2499b8fa72b0cd72c3aa94f68438df5598f6139b24992533fb5014e

Aliases

arxiv: 1210.4421 · arxiv_version: 1210.4421v1 · doi: 10.48550/arxiv.1210.4421 · pith_short_12: PKUIFJOCJGNY · pith_short_16: PKUIFJOCJGNY7JZL · pith_short_8: PKUIFJOC

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/PKUIFJOCJGNY7JZLBTLSYOVJJ5 \
  | 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: 7aa882a5c2499b8fa72b0cd72c3aa94f68438df5598f6139b24992533fb5014e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "77babfd4e27ae22f5882509c8b10ec5b2f9b4833e112e2be01940278b23b7f79",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CT",
    "submitted_at": "2012-10-16T14:13:09Z",
    "title_canon_sha256": "0868fefcc7c85a24204c2bdb4516ae635b45d0de8cd6a8aeaef5b3dc42ecf813"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1210.4421",
    "kind": "arxiv",
    "version": 1
  }
}