Pith Number

pith:ISF4T4EC

pith:2019:ISF4T4ECURN6VYLHUMKCIVUJM4

not attested not anchored not stored refs pending

Configuration spaces of disks in an infinite strip

Hannah Alpert, Matthew Kahle, Robert MacPherson

arxiv:1908.04241 v2 · 2019-08-12 · math.AT · math.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{ISF4T4ECURN6VYLHUMKCIVUJM4}

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	2026-07-05T00:44:56.446424Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

448bc9f082a45beae167a314245689672c6c805cb6feb8db82223a814cfd1bdb

Aliases

arxiv: 1908.04241 · arxiv_version: 1908.04241v2 · doi: 10.48550/arxiv.1908.04241 · pith_short_12: ISF4T4ECURN6 · pith_short_16: ISF4T4ECURN6VYLH · pith_short_8: ISF4T4EC

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/ISF4T4ECURN6VYLHUMKCIVUJM4 \
  | 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: 448bc9f082a45beae167a314245689672c6c805cb6feb8db82223a814cfd1bdb

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c239f24a30b28fc640fe4783cd55c25f785ba1e291c783b409addf06db3049b3",
    "cross_cats_sorted": [
      "math.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AT",
    "submitted_at": "2019-08-12T16:48:37Z",
    "title_canon_sha256": "0f4519c502dc31321700a67b6492eb39bf8eb34a4137a64ce5b49212c67c471f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1908.04241",
    "kind": "arxiv",
    "version": 2
  }
}