Pith Number

pith:PCPTOKDQ

pith:2015:PCPTOKDQCG4C42QWOWFZDO27T7

not attested not anchored not stored refs pending

On Poincare Duality for Orbifolds

Dmytro Yeroshkin

arxiv:1502.03384 v2 · 2015-02-11 · math.AT · math.GT

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{PCPTOKDQCG4C42QWOWFZDO27T7}

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	2026-05-18T00:38:31.582349Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

789f37287011b82e6a16758b91bb5f9fd77d2b82466d650b893148a4932727ff

Aliases

arxiv: 1502.03384 · arxiv_version: 1502.03384v2 · doi: 10.48550/arxiv.1502.03384 · pith_short_12: PCPTOKDQCG4C · pith_short_16: PCPTOKDQCG4C42QW · pith_short_8: PCPTOKDQ

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/PCPTOKDQCG4C42QWOWFZDO27T7 \
  | 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: 789f37287011b82e6a16758b91bb5f9fd77d2b82466d650b893148a4932727ff

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5e830df18de2574c87fa52c0696c1f75387d96414e588214eb350202ae62b0ec",
    "cross_cats_sorted": [
      "math.GT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AT",
    "submitted_at": "2015-02-11T17:16:49Z",
    "title_canon_sha256": "e8ec0f3ae581b6e0f7c5cc5a81f59014477747c7ea71728ab18bdef9cc9154e4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1502.03384",
    "kind": "arxiv",
    "version": 2
  }
}