Pith Number

pith:7IE2A7NT

pith:2019:7IE2A7NTDBDKAJFUQBGDOJPGPS

not attested not anchored not stored refs pending

Block-sparse Recovery of Semidefinite Systems and Generalized Null Space Conditions

Frederic Matter, Janin Heuer, Marc E. Pfetsch, Thorsten Theobald

arxiv:1907.09442 v3 · 2019-07-22 · cs.IT · math.IT · 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{7IE2A7NTDBDKAJFUQBGDOJPGPS}

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	2026-07-05T01:13:41.907869Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

fa09a07db31846a024b4804c3725e67c94428b3e78174f3af4f57e0c21ff3a93

Aliases

arxiv: 1907.09442 · arxiv_version: 1907.09442v3 · doi: 10.48550/arxiv.1907.09442 · pith_short_12: 7IE2A7NTDBDK · pith_short_16: 7IE2A7NTDBDKAJFU · pith_short_8: 7IE2A7NT

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/7IE2A7NTDBDKAJFUQBGDOJPGPS \
  | 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: fa09a07db31846a024b4804c3725e67c94428b3e78174f3af4f57e0c21ff3a93

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9dadc9c165d2618aec50e846ee23e3e456752aaa2d5a8a31241c9be1f573342d",
    "cross_cats_sorted": [
      "math.IT",
      "math.OC"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.IT",
    "submitted_at": "2019-07-22T17:39:18Z",
    "title_canon_sha256": "64377729973e089bdfd69a99944cf8afa35972bc5b3873244c808f24660fc425"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1907.09442",
    "kind": "arxiv",
    "version": 3
  }
}