Pith Number

pith:2PKKZU7F

pith:2026:2PKKZU7F5GQYMQ3O2XNVNPECU3

not attested not anchored not stored refs pending

Optimal $e^{(\gamma+o(1))n}$-Approximation of the Permanent of Positive Semidefinite Matrices

Farzam Ebrahimnejad, Nima Anari

arxiv:2605.21946 v1 · 2026-05-21 · cs.DS

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{2PKKZU7F5GQYMQ3O2XNVNPECU3}

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	2026-05-22T01:04:16.229839Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d3d4acd3e5e9a186436ed5db56bc82a6c44971f7b19c1a9f380bfd2cee709076

Aliases

arxiv: 2605.21946 · arxiv_version: 2605.21946v1 · doi: 10.48550/arxiv.2605.21946 · pith_short_12: 2PKKZU7F5GQY · pith_short_16: 2PKKZU7F5GQYMQ3O · pith_short_8: 2PKKZU7F

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/2PKKZU7F5GQYMQ3O2XNVNPECU3 \
  | 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: d3d4acd3e5e9a186436ed5db56bc82a6c44971f7b19c1a9f380bfd2cee709076

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c6db8596b8f178b6e77939b6e53938e68f2d5d359c358bc55672cffa5947f31a",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DS",
    "submitted_at": "2026-05-21T03:25:29Z",
    "title_canon_sha256": "3b34844503492b952db554abeb5820fcfbef1742564d7c5bed2153697c92a6c8"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.21946",
    "kind": "arxiv",
    "version": 1
  }
}