Part: IVPractical tools

# Part: IV
Practical tools

- Chapter 11: The Coq commands
- Chapter 12: Utilities
- Chapter 13: Extended pattern-matching
- Chapter 14: Implicit Coercions
- Chapter 15: `Omega`: a solver of quantifier-free problems in Presburger Arithmetic
- Chapter 16: Proof of imperative programs
- Chapter 17: Extraction of programs in Objective Caml and Haskell
- Chapter 18: The `Ring` tactic
- Chapter 19: The `Setoid_replace` tactic