Pith Number

pith:DFPKXUFV

pith:2009:DFPKXUFV6CGVZGWCIZFINTT7LP

not attested not anchored not stored refs pending

A Barzilai-Borwein $l_1$-Regularized Least Squares Algorithm for Compressed Sensing

I. Coope, P. Renaud, R. Broughton, R. Tappenden

arxiv:0907.3340 v1 · 2009-07-20 · cs.NA · cs.IT · cs.NA · math.IT

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{DFPKXUFV6CGVZGWCIZFINTT7LP}

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	2026-06-03T23:06:27.835069Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

195eabd0b5f08d5c9ac2464a86ce7f5bcd4cb294142b56c4f9fecff7a604c3c4

Aliases

arxiv: 0907.3340 · arxiv_version: 0907.3340v1 · doi: 10.48550/arxiv.0907.3340 · pith_short_12: DFPKXUFV6CGV · pith_short_16: DFPKXUFV6CGVZGWC · pith_short_8: DFPKXUFV

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/DFPKXUFV6CGVZGWCIZFINTT7LP \
  | 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: 195eabd0b5f08d5c9ac2464a86ce7f5bcd4cb294142b56c4f9fecff7a604c3c4

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "27a139ca86607d618716acd67716adbe6a758f916a515db853f2e029d384796a",
    "cross_cats_sorted": [
      "cs.IT",
      "cs.NA",
      "math.IT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.NA",
    "submitted_at": "2009-07-20T05:45:11Z",
    "title_canon_sha256": "c00712d77b28d8e44fd6e3b9ca3aa601a0c8e42a617333998245aacc5f4870b9"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0907.3340",
    "kind": "arxiv",
    "version": 1
  }
}