Pith Number

pith:WHXWTCBH

pith:2018:WHXWTCBHBH4PL7AY73G4WJWX3K

not attested not anchored not stored refs pending

Reduced basis approximation and a~posteriori error bounds for 4D-Var data assimilation

Karen Veroy, Mark K\"archer, Martin A. Grepl, S\'ebastien Boyaval

arxiv:1802.02328 v1 · 2018-02-07 · 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{WHXWTCBHBH4PL7AY73G4WJWX3K}

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	2026-05-18T00:24:08.586502Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b1ef69882709f8f5fc18fecdcb26d7daa518381967d796426a2093a556d6a852

Aliases

arxiv: 1802.02328 · arxiv_version: 1802.02328v1 · doi: 10.48550/arxiv.1802.02328 · pith_short_12: WHXWTCBHBH4P · pith_short_16: WHXWTCBHBH4PL7AY · pith_short_8: WHXWTCBH

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/WHXWTCBHBH4PL7AY73G4WJWX3K \
  | 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: b1ef69882709f8f5fc18fecdcb26d7daa518381967d796426a2093a556d6a852

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f8c94c973b237c4721caf73dc9d8a42ce3481959e0552e285d0b771ad7ff2880",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.OC",
    "submitted_at": "2018-02-07T07:36:02Z",
    "title_canon_sha256": "12caee843c0274ca82eaa65ec7e192b53b1efebdf7236f5cf6d8eeb2581c8b1b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1802.02328",
    "kind": "arxiv",
    "version": 1
  }
}