Pith Number

pith:NFDPYQKY

pith:2012:NFDPYQKYC55GR4EFIA54YX4UZP

not attested not anchored not stored refs pending

A direct solver with reutilization of previously-computed LU factorizations for h-adaptive finite element grids with point singularities

David Pardo, Maciej Paszynski, Victor Calo

arxiv:1212.1992 v1 · 2012-12-10 · 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{NFDPYQKYC55GR4EFIA54YX4UZP}

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	2026-05-18T03:38:54.562071Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6946fc4158177a68f085403bcc5f94cbc8da6359632ec45593c441f2324bbe66

Aliases

arxiv: 1212.1992 · arxiv_version: 1212.1992v1 · doi: 10.48550/arxiv.1212.1992 · pith_short_12: NFDPYQKYC55G · pith_short_16: NFDPYQKYC55GR4EF · pith_short_8: NFDPYQKY

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/NFDPYQKYC55GR4EFIA54YX4UZP \
  | 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: 6946fc4158177a68f085403bcc5f94cbc8da6359632ec45593c441f2324bbe66

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "fc00199d91b93cf395ce3493c526556f9462208f7c47cd2a31508b55a833971a",
    "cross_cats_sorted": [
      "math.NA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.NA",
    "submitted_at": "2012-12-10T08:31:14Z",
    "title_canon_sha256": "95ee3ae4791679af70c2e498485020a82d9c5c6373a4f8e15ccb0cb3de91400b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1212.1992",
    "kind": "arxiv",
    "version": 1
  }
}