Pith Number

pith:XYJ47FRK

pith:2018:XYJ47FRKC4HCKPK2SYERGAYM6A

not attested not anchored not stored refs pending

Irreducible infeasible subsystems of semidefinite systems

Kai Kellner, Marc E. Pfetsch, Thorsten Theobald

arxiv:1804.01327 v2 · 2018-04-04 · math.OC

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{XYJ47FRKC4HCKPK2SYERGAYM6A}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more

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	2026-05-17T23:55:59.187930Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

be13cf962a170e253d5a960913030cf0378ba02cc58a9bf863261c582f2cf9c1

Aliases

arxiv: 1804.01327 · arxiv_version: 1804.01327v2 · doi: 10.48550/arxiv.1804.01327 · pith_short_12: XYJ47FRKC4HC · pith_short_16: XYJ47FRKC4HCKPK2 · pith_short_8: XYJ47FRK

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/XYJ47FRKC4HCKPK2SYERGAYM6A \
  | 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: be13cf962a170e253d5a960913030cf0378ba02cc58a9bf863261c582f2cf9c1

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ce17550f9ee7e5b7b5e3397371d6027a40dafe74765afd18deece9aa4d36896f",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.OC",
    "submitted_at": "2018-04-04T10:05:48Z",
    "title_canon_sha256": "30c866eff1ea501b6135b8dce0535ef932a897c269da191f7e16043e3ceb231f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1804.01327",
    "kind": "arxiv",
    "version": 2
  }
}