Pith Number

pith:44XH35Y4

pith:2009:44XH35Y4XECCXSQULBQGYNVMEG

not attested not anchored not stored refs pending

Additivity and non-additivity for perverse signatures

Eugenie Hunsicker, Greg Friedman

arxiv:0911.3915 v3 · 2009-11-19 · 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{44XH35Y4XECCXSQULBQGYNVMEG}

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	2026-05-18T03:07:32.288230Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e72e7df71cb9042bca1458606c36ac21b1af2f3891ebd8fbe5a135c071f54e4a

Aliases

arxiv: 0911.3915 · arxiv_version: 0911.3915v3 · doi: 10.48550/arxiv.0911.3915 · pith_short_12: 44XH35Y4XECC · pith_short_16: 44XH35Y4XECCXSQU · pith_short_8: 44XH35Y4

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/44XH35Y4XECCXSQULBQGYNVMEG \
  | 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: e72e7df71cb9042bca1458606c36ac21b1af2f3891ebd8fbe5a135c071f54e4a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "1ba247cfd82770149e5040318fea80437c1f4b6dc09eb23609072a11030e1917",
    "cross_cats_sorted": [
      "math.AT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.GT",
    "submitted_at": "2009-11-19T21:25:50Z",
    "title_canon_sha256": "d0df8f9dba71574e968d355023c9e1fbdcee4b68485de305d603276320e568e0"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0911.3915",
    "kind": "arxiv",
    "version": 3
  }
}