Chapter 2
Basic Notions

 2.1 What is a proof obligation?
 2.2 What is a well-typed predicate?
 2.3 What is a well-defined expression?
  2.3.1 Presentation
  2.3.2 Conditions of well-definedness
 2.4 What is a rule?
 2.5 What is a theory?
 2.6 What is a tactic?
 2.7 What is a proof?
 2.8 The prover
 2.9 What is a prover loop?
 2.10 What is a command?