(Co-)Iteration for Higher-Order Nested Datatypes.- Program Extraction in Simply-Typed Higher Order Logic.- General Recursion in Type Theory.- Using Theory Morphisms for Implementing Formal Methods Tools.- Subsets, Quotients and Partial Functions in Martin-Löf's Type Theory.- Mathematical Quotients and Quotient Types in Coq.- A Constructive Formalization of the Fundamental Theorem of Calculus.- Two Behavioural Lambda Models.- A Unifying Approach to Recursive and Co-recursive Definitions.- Holes with Binding Power.- Typing with Conditions and Guarantees for Functional In-place Update.- A New Extraction for Coq.- Weak Transitivity in Coercive Subtyping.- The Not So Simple Proof-Irrelevant Model of CC.- Structured Proofs in Isar/HOL.- Java as a Functional Programming Language.- Monad Translating Inductive and Coinductive Types.- A Finite First-Order Presentation of Set Theory.