Pith Number

pith:RTCBDBJM

pith:2023:RTCBDBJM5V5CNKMTIVEVOUNZK3

not attested not anchored not stored refs pending

Sparse inverse Cholesky factorization of dense kernel matrices by greedy conditional selection

Florian Sch\"afer, Houman Owhadi, Joseph Guinness, Matthias Katzfuss, Stephen Huan

arxiv:2307.11648 v2 · 2023-07-21 · stat.CO · cs.NA · math.NA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{RTCBDBJM5V5CNKMTIVEVOUNZK3}

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	2026-07-05T11:00:34.910985Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8cc411852ced7a26a99345495751b956f62afc46dce53078a5aeb7401cbbdac1

Aliases

arxiv: 2307.11648 · arxiv_version: 2307.11648v2 · doi: 10.48550/arxiv.2307.11648 · pith_short_12: RTCBDBJM5V5C · pith_short_16: RTCBDBJM5V5CNKMT · pith_short_8: RTCBDBJM

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/RTCBDBJM5V5CNKMTIVEVOUNZK3 \
  | 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: 8cc411852ced7a26a99345495751b956f62afc46dce53078a5aeb7401cbbdac1

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3e1715bff67a39a342fdc2ad5820cd1e45a5206eb3dca690b6b80fa7033a6c24",
    "cross_cats_sorted": [
      "cs.NA",
      "math.NA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "stat.CO",
    "submitted_at": "2023-07-21T15:27:17Z",
    "title_canon_sha256": "a30cf3b76168a1c62feb3b65d6222d0be88575f19513864b297ba37016ae2d8b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2307.11648",
    "kind": "arxiv",
    "version": 2
  }
}