Pith Number

pith:IR2FK7V3

pith:2026:IR2FK7V3WG7LQXEHRV57U5HIT4

not attested not anchored not stored refs pending

A fast spectral-multigrid Poisson solver in non-Cartesian geometries

Andrea Mignone, Ankush Mandal, Oliver Gressel, Udo Ziegler

arxiv:2606.17636 v1 · 2026-06-16 · astro-ph.IM · astro-ph.EP · astro-ph.GA · astro-ph.HE · astro-ph.SR

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{IR2FK7V3WG7LQXEHRV57U5HIT4}

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	2026-06-19T16:10:17.834758Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

4474557ebbb1beb85c878d7bfa74e89f330b5a406181443c1d418e879e4a5456

Aliases

arxiv: 2606.17636 · arxiv_version: 2606.17636v1 · doi: 10.48550/arxiv.2606.17636 · pith_short_12: IR2FK7V3WG7L · pith_short_16: IR2FK7V3WG7LQXEH · pith_short_8: IR2FK7V3

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/IR2FK7V3WG7LQXEHRV57U5HIT4 \
  | 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: 4474557ebbb1beb85c878d7bfa74e89f330b5a406181443c1d418e879e4a5456

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "df488b4798988cd5c4923c00e47d8af482c5c3add702aeae49c89adb4dff4785",
    "cross_cats_sorted": [
      "astro-ph.EP",
      "astro-ph.GA",
      "astro-ph.HE",
      "astro-ph.SR"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.IM",
    "submitted_at": "2026-06-16T07:46:42Z",
    "title_canon_sha256": "a108a1ebb19f1efb5670a1accfc116ad31d541ab6f2fed3027b6ed7e28740f65"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2606.17636",
    "kind": "arxiv",
    "version": 1
  }
}