Pith Number

pith:67M3ALPS

pith:2018:67M3ALPSDSWC3KC4DIHTD2KCZ7

not attested not anchored not stored refs pending

What is the correct cost functional for variational data assimilation?

Jochen Br\"ocker

arxiv:1804.06175 v1 · 2018-04-17 · physics.ao-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{67M3ALPSDSWC3KC4DIHTD2KCZ7}

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	2026-05-18T00:18:21.494710Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f7d9b02df21cac2da85c1a0f31e942cff91183a134ca460f840e2a51614f9127

Aliases

arxiv: 1804.06175 · arxiv_version: 1804.06175v1 · doi: 10.48550/arxiv.1804.06175 · pith_short_12: 67M3ALPSDSWC · pith_short_16: 67M3ALPSDSWC3KC4 · pith_short_8: 67M3ALPS

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/67M3ALPSDSWC3KC4DIHTD2KCZ7 \
  | 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: f7d9b02df21cac2da85c1a0f31e942cff91183a134ca460f840e2a51614f9127

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9dc986a32b2893fa815363e0acac9bff7b0c3de97f0a85e1b45e845803741da2",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.ao-ph",
    "submitted_at": "2018-04-17T11:45:00Z",
    "title_canon_sha256": "90b8bf012106d84ac14086bf64b0abe77749cd59ffe06011254a664084b91cc3"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1804.06175",
    "kind": "arxiv",
    "version": 1
  }
}