# 📐 L2 Spec — Neutron Transport — linear Boltzmann equation Mismatch-Only Spec
**ID:** `L2-354-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-354`](/artifact/l1/L1-354)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.48 · **Delta tier:** 5
> **⛓ On-chain block:** 41554100
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 16 – 512 |
| W | px | 16 – 512 |
| Z | — | 16 – 512 |
| Snr db | dB | 0 – 40 |
| N detectors | — | 4 – 256 |
| N angular dir | — | 4 – 288 |
| Xs data error | — | 0.0 – 0.05 |
| N energy groups | — | 1 – 500 |
| Material homo error | — | 0.0 – 0.1 |
| Boundary albedo error | — | 0.0 – 0.2 |
| Source spectrum error | — | 0.0 – 0.2 |
## 2. Tolerance (ε)
**Type:** `fn`
```
3.0 + 50.0*xs_data_error + 15.0*source_spectrum_error + 20.0*material_homo_error
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.48 |
| Delta tier | 5 |
## 4. Fingerprint
`ba87247a620ee611fc81eaf4feba1a4ed41d2eebdf4ad3b132ba346b438e0edc`
## 5. On-chain Registration
- **Chain hash:** `0x363607e6303adbd7accd7ffddd5321c8bd8092491769fcf2585226fd5c8765d5`
- **Chain tx hash:** `0xb3f5a327490a21b48fb78f896316e613d9732fa210a97307795a70df02651c3b`
- **Chain block:** `41554100`
---
## File Mapping
This bundle consists of: `L2-354-001.md`, `L2-354-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-354-001.md` | Source of truth — edit this | Human or LLM |
| `L2-354-001.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 `L2-354-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._