Pith Number

pith:25JD57XR

pith:2019:25JD57XRALQOG2LKBEBITPGRY3

not attested not anchored not stored refs pending

Two short proofs of the topological invariance of intersection homology

Greg Friedman

arxiv:1904.06456 v2 · 2019-04-13 · 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{25JD57XRALQOG2LKBEBITPGRY3}

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	2026-05-17T23:44:21.323408Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d7523efef102e0e3696a090289bcd1c6f4173b746f075d111228ae3423c228c6

Aliases

arxiv: 1904.06456 · arxiv_version: 1904.06456v2 · doi: 10.48550/arxiv.1904.06456 · pith_short_12: 25JD57XRALQO · pith_short_16: 25JD57XRALQOG2LK · pith_short_8: 25JD57XR

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/25JD57XRALQOG2LKBEBITPGRY3 \
  | 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: d7523efef102e0e3696a090289bcd1c6f4173b746f075d111228ae3423c228c6

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3632f775c489b5fd73ec0fc28def7198d278579714369e3e3fec0c42a0cc78d2",
    "cross_cats_sorted": [
      "math.AT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.GT",
    "submitted_at": "2019-04-13T00:36:52Z",
    "title_canon_sha256": "33162456f74f2b80ff6182f6d7a8929086f6f0545b21a32e41879f61ec7dd1f3"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1904.06456",
    "kind": "arxiv",
    "version": 2
  }
}