Pith Number

pith:UUAUUUXT

pith:2023:UUAUUUXTXMUR5JHLU4IV64E5TV

not attested not anchored not stored refs pending

Hierarchical off-diagonal low-rank approximation of Hessians in inverse problems, with application to ice sheet model initializaiton

(2) Courant Institute of Mathematical Sciences, (3) Center for Computing Research, Georg Stadler (2), Kim Liegeois (3), Mauro Perego (3), Merced, New York University, Noemi Petra (1) ((1) Department of Applied Mathematics, Sandia National Laboratories), Tucker Hartland (1), University of California

arxiv:2301.03644 v1 · 2023-01-09 · math.NA · cs.NA · math.OC

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{UUAUUUXTXMUR5JHLU4IV64E5TV}

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	2026-07-05T06:27:28.517065Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a5014a52f3bb291ea4eba7115f709d9d4b2a562bc2e3345acdf90d6a082a50bf

Aliases

arxiv: 2301.03644 · arxiv_version: 2301.03644v1 · doi: 10.48550/arxiv.2301.03644 · pith_short_12: UUAUUUXTXMUR · pith_short_16: UUAUUUXTXMUR5JHL · pith_short_8: UUAUUUXT

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/UUAUUUXTXMUR5JHLU4IV64E5TV \
  | 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: a5014a52f3bb291ea4eba7115f709d9d4b2a562bc2e3345acdf90d6a082a50bf

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "0476edd063b078f8c0fc2f5cce6eafa10eeb74045a0767a4338822c7f0e27420",
    "cross_cats_sorted": [
      "cs.NA",
      "math.OC"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2023-01-09T19:30:41Z",
    "title_canon_sha256": "cd0d724b42d1be847c9584daf10cb320a1a68467b1e1d26836a3872a3553060e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2301.03644",
    "kind": "arxiv",
    "version": 1
  }
}