# 📐  L2 Spec — SEIR Epidemic with Exposed Compartment — Nominal + Mismatch Specs

**ID:** `L2-406-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-406`](/artifact/l1/L1-406)

> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.28 · **Delta tier:** 5
> **⛓ On-chain block:** 41555221

---

## 1. Domain Ω

**Type:** `range`

| Parameter | Unit | Range |
|---|---|---|
| N days | — | 20 – 730 |
| R0 true | — | 1.0 – 10.0 |
| Detection rate | — | 0.05 – 1.0 |
| Incubation period days | — | 1 – 20 |

## 2. Tolerance (ε)

**Type:** `fn`

```
10 + 10 * (0.5 / detection_rate) ** 0.5
```

## 3. Difficulty

| Property | Value |
|---|---|
| Difficulty score | 0.28 |
| Delta tier | 5 |

## 4. Fingerprint

`dd27c3c6c3faae1f39ef06e88172310d281d3c6222e4b925df154a2f0f87441c`

## 5. On-chain Registration

- **Chain hash:** `0x4e01d40f45fc4dc5079cb87cce65e02dd55d5ed85df3141d8806b9ea47b15e00`
- **Chain tx hash:** `0xb2807c0fa74ecaf85aa6fec8c1d06a58745b2be6ca3dde65b5fecd21b390a19d`
- **Chain block:** `41555221`

---

## File Mapping

This bundle consists of: `L2-406-001.md`, `L2-406-001.json`.

| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-406-001.md` | Source of truth — edit this | Human or LLM |
| `L2-406-001.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 `L2-406-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._