Pith Number

pith:M5I5G5ID

pith:2010:M5I5G5IDD7LFTBJHWZS45ONE2S

not attested not anchored not stored refs pending

On the cohomology of classifying spaces of groups of homeomorphisms

Jarek K\k{e}dra

arxiv:1010.2922 v1 · 2010-10-14 · math.AT · math.GT · math.SG

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{M5I5G5IDD7LFTBJHWZS45ONE2S}

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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	2026-05-18T04:39:18.867342Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6751d375031fd6598527b665ceb9a4d4b43342540de090fa11bedc0cdf760e62

Aliases

arxiv: 1010.2922 · arxiv_version: 1010.2922v1 · doi: 10.48550/arxiv.1010.2922 · pith_short_12: M5I5G5IDD7LF · pith_short_16: M5I5G5IDD7LFTBJH · pith_short_8: M5I5G5ID

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/M5I5G5IDD7LFTBJHWZS45ONE2S \
  | 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: 6751d375031fd6598527b665ceb9a4d4b43342540de090fa11bedc0cdf760e62

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3194b33b8bda79255650dc419fb6211b86b27c9d5c45367982244920ca5ec866",
    "cross_cats_sorted": [
      "math.GT",
      "math.SG"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AT",
    "submitted_at": "2010-10-14T13:54:47Z",
    "title_canon_sha256": "357c2c47bddfa79cfa669bafbbeae83a5137dc4a7deb3864da7ac9023144346d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1010.2922",
    "kind": "arxiv",
    "version": 1
  }
}