# 📐  L2 Spec — Post-Hartree-Fock Correlated Methods (MP2, CCSD, CI) Mismatch-Only Spec

**ID:** `L2-296-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-296`](/artifact/l1/L1-296)

> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.45 · **Delta tier:** 5
> **⛓ On-chain block:** 41554116

---

## 1. Domain Ω

**Type:** `range`

| Parameter | Unit | Range |
|---|---|---|
| Basis | — | cc-pVDZ, cc-pVTZ, cc-pVQZ, aug-cc-pV5Z |
| Method | — | MP2, CCSD, CCSD(T), CCSDT |
| N basis | — | 20 – 5000 |
| N electrons | — | 2 – 300 |

## 2. Tolerance (ε)

**Type:** `fn`

```
1.0 * (1 + 0.1 * mismatch_severity)
```

## 3. Difficulty

| Property | Value |
|---|---|
| Difficulty score | 0.45 |
| Delta tier | 5 |

## 4. Fingerprint

`fe2db27cdf702c8248104e7dff156e1eb137a81d636ffcaff18aabbb16bb0e96`

## 5. On-chain Registration

- **Chain hash:** `0x0417cdc63aebf53a3f33db0c7f9756bc79c275f7338bcdb130d1fe00cde5f9f6`
- **Chain tx hash:** `0x4ec6ae313803e30a6bd7a1657095bd516b24b8f6f852e0734aefccf43c5d3e9d`
- **Chain block:** `41554116`

---

## File Mapping

This bundle consists of: `L2-296-001.md`, `L2-296-001.json`.

| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-296-001.md` | Source of truth — edit this | Human or LLM |
| `L2-296-001.json` | Structured metadata for the registry | LLM regenerates from the sections above |

**Prompt for your LLM after editing this Markdown:**

> Read the attached Markdown. Regenerate the sibling `.json` so every field matches.
> Preserve the schema documented in the rows above.
> Output each file in its own fenced code block tagged with the filename.
> Output only the JSON object.

_This Markdown was auto-synthesized from the catalog row for `L2-296-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._