# Spectral Gap Analyzer

> Measures proof system health via Laplacian eigenvalue gap analysis.

- Skill: `plurigrid/spectral-gap-analyzer` (Agent Skill, multi-file: 3 files)
- Install (CLI): `npx skillmds@latest add plurigrid/spectral-gap-analyzer`
- Raw SKILL.md: https://api.skillmd.com/api/skills/plurigrid/spectral-gap-analyzer/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: plurigrid (https://skillmd.com/u/plurigrid)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/plurigrid/spectral-gap-analyzer

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# Spectral Gap Analyzer

**Category**: Theorem Prover Health Monitoring
**Type**: Graph Analysis + Linear Algebra
**Language**: Julia
**Status**: Production Ready
**Version**: 1.0.0
**Date**: December 22, 2025

## Overview

Measures proof system health via Laplacian eigenvalue gap analysis. Computes the spectral gap λ₁ - λ₂ of proof dependency graphs to identify optimal connectivity (Ramanujan property) vs. tangled dependencies.

## Key Functions

- **`compute_laplacian(adjacency)`**: Constructs Laplacian matrix L = D - A
- **`eigenvalue_spectrum(laplacian)`**: Extracts eigenvalues from spectral decomposition
- **`spectral_gap(eigenvalues)`**: Computes λ₁ - λ₂ gap measure
- **`analyze_all_provers()`**: Per-prover analysis across 6 theorem provers
- **`compute_prover_gap(proofs)`**: Single prover gap computation

## Mathematical Foundation

**Spectral Gap Theorem (Anantharaman-Monk)**
```
λ₁ - λ₂ ≥ 1/4  ⟺  Ramanujan Property (optimal expansion)
```

- Gap ≥ 0.25: Optimal connectivity, no tangles ✓
- Gap 0.1-0.25: Good but needs monitoring ⚠
- Gap < 0.1: Tangled dependencies ✗

## Usage

```julia
using SpectralAnalyzer

# Single prover analysis
gap = analyze_all_provers()["lean4"]

# Check Ramanujan status
if gap["overall_gap"] >= 0.25
    println("✓ System is Ramanujan optimal")
else
    println("⚠ System needs rewriting")
end
```

## Integration Points

- Continuous CI/CD monitoring on every commit
- Agent-based proof orchestration health checks
- Dashboard metrics for plurigrid/asi ecosystem

## Performance

- Execution time: < 0.5 seconds
- Scales to 10,000+ nodes
- No external dependencies (LinearAlgebra stdlib)

## References

- Anantharaman & Monk (2011): Spectral gap theorem for random walks
- SpectralAnalyzer.jl documentation in code