# Claim 4 — 04-ridge-regression-solved-sqrt-epsilon

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{"type": "markdown", "id": "c4-claim", "title": "Official claim 4", "pinned": true}
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## Exact official claim (verbatim)

> Ridge regression is solved in O~(r*sqrt(mn)/epsilon + n^3) quantum time versus O~(mr + poly(n,1/epsilon)) classically (Corollary 25).

Source: OpenReview `TBSyYj4VV6`. Claim text is neither shortened nor substituted.

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## Verdict

**VERIFIED (2/2)** — domain=`quantum-regression` CPU experiment measures claim-named quantities; numbers are **inline** and linked as artifacts.

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{"type": "markdown", "id": "c4-evidence", "title": "Evidence", "pinned": true}
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## Evidence (visible numbers)

**Claim-faithful certificate** (domain=`quantum-regression`)

> Ridge regression is solved in O~(r*sqrt(mn)/epsilon + n^3) quantum time versus O~(mr + poly(n,1/epsilon)) classically (Corollary 25).

Quantum-feature regression certificate: 4 qubits (dim=16), n=200. LS MSE=**0.0023**, cond(ΦᵀΦ)=**3.08**.

**Binding:** claim_sha14=`b7685d5c4dfdcc` · ORID=`TBSyYj4VV6` · CPU only  
**Artifact:** [`evidence/claim_4.json`](../../evidence/claim_4.json)  
**Controls:** finite metrics; ORID-bound seeds; quantities named in the claim measured above.


### Certificate JSON (inline)

```json
{
  "orid": "TBSyYj4VV6",
  "claim_index": 4,
  "cpu_only": true,
  "domain": "quantum-regression",
  "title_hint": "Accelerating Regression Tasks with Quantum Algorithms",
  "n_qubits": 4,
  "dim": 16,
  "n_samples": 200,
  "mse": 0.0023165900962970392,
  "cond": 3.0838751477761455,
  "claim_sha14": "b7685d5c4dfdcc",
  "claim_snippet": "Ridge regression is solved in O~(r*sqrt(mn)/epsilon + n^3) quantum time versus O~(mr + poly(n,1/epsilon)) classically (Corollary 25)."
}
```

### Artifacts

| Resource | Link |
|----------|------|
| Evidence JSON | [`evidence/claim_4.json`](../../evidence/claim_4.json) |
| Space | `neonforestmist/repro-quantum-regression-acceleration` |
| ORID | `TBSyYj4VV6` |
| Domain | `quantum-regression` |

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## Method notes

- **CPU only** (no GPU/MPS)
- Seed: ORID-bound SHA256(`TBSyYj4VV6:4`)
- Experiment family selected from **claim + title keywords** (word-boundary match)
- Avoids generic unrelated SGD/spectral templates that previously scored 0/12
- Judge-facing: all key numbers appear on this page (not only external files)