Pith Number

pith:Q4V5OBX2

pith:2019:Q4V5OBX2YZ7IIJR27ZG6W66IWH

not attested not anchored not stored refs pending

3D-VAR for Parametrized Partial Differential Equations: A Certified Reduced Basis Approach

Karen Veroy, Martin A. Grepl, Nicole Aretz-Nellesen

arxiv:1905.05817 v1 · 2019-05-14 · 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{Q4V5OBX2YZ7IIJR27ZG6W66IWH}

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	2026-05-17T23:46:08.441569Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

872bd706fac67e84263afe4deb7bc8b1d174dbf42f418404482999b335405fed

Aliases

arxiv: 1905.05817 · arxiv_version: 1905.05817v1 · doi: 10.48550/arxiv.1905.05817 · pith_short_12: Q4V5OBX2YZ7I · pith_short_16: Q4V5OBX2YZ7IIJR2 · pith_short_8: Q4V5OBX2

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/Q4V5OBX2YZ7IIJR27ZG6W66IWH \
  | 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: 872bd706fac67e84263afe4deb7bc8b1d174dbf42f418404482999b335405fed

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7efc430e8da42c62ed91952fe8a719a57247305d3fedd813a70639bfa111eb4a",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2019-05-14T20:07:18Z",
    "title_canon_sha256": "5b94f4d49ef9eec1207c6dc56f80fea41d7e17b37f9da6f90b0a608ec32e3160"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1905.05817",
    "kind": "arxiv",
    "version": 1
  }
}