Pith Number

pith:B76MXZMP

pith:2021:B76MXZMPSTM4JXQECKWKCGOMLE

not attested not anchored not stored refs pending

Convergent least-squares optimisation methods for variational data assimilation

Amos S. Lawless, Coralia Cartis, Maha H. Kaouri, Nancy K. Nichols

arxiv:2107.12361 v1 · 2021-07-26 · 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{B76MXZMPSTM4JXQECKWKCGOMLE}

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	2026-07-05T03:00:42.929186Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

0ffccbe58f94d9c4de0412aca119cc5908a7be1ab841dfe7fc3ca8cd762335ba

Aliases

arxiv: 2107.12361 · arxiv_version: 2107.12361v1 · doi: 10.48550/arxiv.2107.12361 · pith_short_12: B76MXZMPSTM4 · pith_short_16: B76MXZMPSTM4JXQE · pith_short_8: B76MXZMP

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/B76MXZMPSTM4JXQECKWKCGOMLE \
  | 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: 0ffccbe58f94d9c4de0412aca119cc5908a7be1ab841dfe7fc3ca8cd762335ba

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "bb72c33a58c0b200cc15accd242ec3c9387e4211cc7d542f994faf34de762c9f",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "math.OC",
    "submitted_at": "2021-07-26T17:54:44Z",
    "title_canon_sha256": "2a636458001bb944c8c2e66ad54464ec787346f3f05969bee56fdd421b71a061"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2107.12361",
    "kind": "arxiv",
    "version": 1
  }
}