Pith Number

pith:2PKEVH54

pith:2017:2PKEVH54OXGTSKPYP3V7WEWHFM

not attested not anchored not stored refs pending

A low-rank approach to the solution of weak constraint variational data assimilation problems

Daniel L. H. Green, Melina A. Freitag

arxiv:1702.07278 v1 · 2017-02-23 · math.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{2PKEVH54OXGTSKPYP3V7WEWHFM}

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	2026-05-18T00:23:39.932821Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d3d44a9fbc75cd3929f87eebfb12c72b2a3725e1ba1ab8b727d7fef4a2293cd8

Aliases

arxiv: 1702.07278 · arxiv_version: 1702.07278v1 · doi: 10.48550/arxiv.1702.07278 · pith_short_12: 2PKEVH54OXGT · pith_short_16: 2PKEVH54OXGTSKPY · pith_short_8: 2PKEVH54

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/2PKEVH54OXGTSKPYP3V7WEWHFM \
  | 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: d3d44a9fbc75cd3929f87eebfb12c72b2a3725e1ba1ab8b727d7fef4a2293cd8

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d256dff627c8c796bf172712b737e8c57f092de003ccacc493133dd385f6bda4",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2017-02-23T16:14:48Z",
    "title_canon_sha256": "c232706c91e74ab02df67ada1b6cde9b5e5533f73ab84b277dc36a27d68325df"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1702.07278",
    "kind": "arxiv",
    "version": 1
  }
}