Pith Number

pith:NUS66O7R

pith:2008:NUS66O7R52Q35IBRLPYIN6EWMQ

not attested not anchored not stored refs pending

Algebraic topology from geometric viewpoint

A. Skopenkov

arxiv:0808.1395 v4 · 2008-08-10 · math.GT · math.AT

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{NUS66O7R52Q35IBRLPYIN6EWMQ}

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	2026-05-18T01:14:45.995141Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6d25ef3bf1eea1bea0315bf086f89664341724353eba01984e1812e70096aff2

Aliases

arxiv: 0808.1395 · arxiv_version: 0808.1395v4 · doi: 10.48550/arxiv.0808.1395 · pith_short_12: NUS66O7R52Q3 · pith_short_16: NUS66O7R52Q35IBR · pith_short_8: NUS66O7R

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/NUS66O7R52Q35IBRLPYIN6EWMQ \
  | 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: 6d25ef3bf1eea1bea0315bf086f89664341724353eba01984e1812e70096aff2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a53273293df3137a960b9624b222dbbb97c1e5ebb388be3e7e55b436929afaf7",
    "cross_cats_sorted": [
      "math.AT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.GT",
    "submitted_at": "2008-08-10T09:02:44Z",
    "title_canon_sha256": "1e3fcd97bd52cb634dc08c50f98035f78b8bf4b828f0ea7f5153ad117f50d550"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0808.1395",
    "kind": "arxiv",
    "version": 4
  }
}