Pith Number

pith:6CP6QKYW

pith:2025:6CP6QKYWJWQWZGVT3COS6PSTVW

not attested not anchored not stored refs pending

A deep first-order system least squares method for the obstacle problem

Eugenia Bel\'en, Francisco M. Bersetche, Gabriel Acosta, Juan Pablo Borthagaray

arxiv:2508.19412 v1 · 2025-08-26 · 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{6CP6QKYWJWQWZGVT3COS6PSTVW}

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	2026-07-05T12:00:11.047985Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f09fe82b164da16c9ab3d89d2f3e53ad959d52dd97f95c8255a5089335fec86f

Aliases

arxiv: 2508.19412 · arxiv_version: 2508.19412v1 · doi: 10.48550/arxiv.2508.19412 · pith_short_12: 6CP6QKYWJWQW · pith_short_16: 6CP6QKYWJWQWZGVT · pith_short_8: 6CP6QKYW

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/6CP6QKYWJWQWZGVT3COS6PSTVW \
  | 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: f09fe82b164da16c9ab3d89d2f3e53ad959d52dd97f95c8255a5089335fec86f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "420bef2845aa70a15c37326a7ff85775607459d6ff2004e8c24e6d2d195d8d2a",
    "cross_cats_sorted": [
      "cs.NA"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2025-08-26T20:28:59Z",
    "title_canon_sha256": "52357b2eb5a78feb202c8af579c22a8be269a76ab7cc385371801d6d39967f91"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2508.19412",
    "kind": "arxiv",
    "version": 1
  }
}