Pith Number

pith:TC5J4VWE

pith:2014:TC5J4VWEHPDC6SGCGI5SMCNWII

not attested not anchored not stored refs pending

Diagonal approximation and the cohomology ring of the fundamental groups of surfaces

Daciberg Lima Goncalves, Sergio Tadao Martins

arxiv:1404.0666 v1 · 2014-04-02 · 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{TC5J4VWEHPDC6SGCGI5SMCNWII}

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	2026-05-18T02:54:56.788756Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

98ba9e56c43bc62f48c2323b2609b6421c30f65a1541b4edb3f92ce64c62647f

Aliases

arxiv: 1404.0666 · arxiv_version: 1404.0666v1 · doi: 10.48550/arxiv.1404.0666 · pith_short_12: TC5J4VWEHPDC · pith_short_16: TC5J4VWEHPDC6SGC · pith_short_8: TC5J4VWE

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/TC5J4VWEHPDC6SGCGI5SMCNWII \
  | 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: 98ba9e56c43bc62f48c2323b2609b6421c30f65a1541b4edb3f92ce64c62647f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e0abbc8cea568fb4d85cdc0a7d541e1e01c6b05ec929a5a7113423d285de8e84",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AT",
    "submitted_at": "2014-04-02T19:53:09Z",
    "title_canon_sha256": "5da3fa687314487ac087582ddeed65aaa6bb72fad97c29405e629beb865579fb"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1404.0666",
    "kind": "arxiv",
    "version": 1
  }
}