Pith Number

pith:5AWQSD3Z

pith:2020:5AWQSD3ZKOZO3OGZ2BOMHUXKX6

not attested not anchored not stored refs pending

Second Order Accurate Hierarchical Approximate Factorization of Sparse SPD Matrices

Bazyli Klockiewicz, Eric Darve, Hamdi Tchelepi, L\'eopold Cambier, Ryan Humble

arxiv:2007.00789 v3 · 2020-07-01 · math.NA · cs.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{5AWQSD3ZKOZO3OGZ2BOMHUXKX6}

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	2026-07-05T01:24:16.792763Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e82d090f7953b2edb8d9d05cc3d2eabf8e06cba747fb0db3b63f2f0f26e55d60

Aliases

arxiv: 2007.00789 · arxiv_version: 2007.00789v3 · doi: 10.48550/arxiv.2007.00789 · pith_short_12: 5AWQSD3ZKOZO · pith_short_16: 5AWQSD3ZKOZO3OGZ · pith_short_8: 5AWQSD3Z

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/5AWQSD3ZKOZO3OGZ2BOMHUXKX6 \
  | 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: e82d090f7953b2edb8d9d05cc3d2eabf8e06cba747fb0db3b63f2f0f26e55d60

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2909cca1eced7b891f2314321a810bab68bb7c3d21cf24067242413835e15363",
    "cross_cats_sorted": [
      "cs.NA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2020-07-01T22:12:22Z",
    "title_canon_sha256": "580c29fcd710e7e602fcbf3a999ac1d1f4ee295c32e78905296f8da4891c5f3b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2007.00789",
    "kind": "arxiv",
    "version": 3
  }
}