Markus Wenzel – författare

This textbook-like tutorial is a self-contained introduction to interactive proof, specification, and verification in higher-order logic, using the proof assistant Isabelle 2002. In contrast to existing Isabelle documentation, this book provides a direct route into higher-order logic by bypassing first-order logic and minimizing discussion of meta-theory.Isabelle is a generic system for implementing logical formalisms, and Isabelle/HOL is the specialization of Isabelle for higher-order logic; this theorem prover is well suited as a specification and verification system.

This volume is a self-contained introduction to interactive proof in high- order logic (HOL), using the proof assistant Isabelle 2002. Compared with existing Isabelle documentation, it provides a direct route into higher-order logic, which most people prefer these days. It bypasses ?rst-order logic and minimizes discussion of meta-theory. It is written for potential users rather than for our colleagues in the research world. Another departure from previous documentation is that we describe Markus Wenzel’s proof script notation instead of ML tactic scripts. The l- ter make it easier to introduce new tactics on the ?y, but hardly anybody does that. Wenzel’s dedicated syntax is elegant, replacing for example eight simpli?cation tactics with a single method, namely simp, with associated - tions. The book has three parts. – The ?rst part, Elementary Techniques, shows how to model functional programs in higher-order logic. Early examples involve lists and the natural numbers. Most proofs are two steps long, consisting of induction on a chosen variable followed by the auto tactic. But even this elementary part covers such advanced topics as nested and mutual recursion. – The second part, Logic and Sets, presents a collection of lower-level tactics that you can use to apply rules selectively. It also describes I- belle/HOL’s treatment of sets, functions, and relations and explains how to de?ne sets inductively. One of the examples concerns the theory of model checking, and another is drawn from a classic textbook on formal languages.

Die Autoren untersuchen in diesem essential Chancen und Risiken der Nutzung von Cloud-Technologien und veranschaulichen das Thema durch Beispiele aus Forschung und Praxis. Sie erklären Grundlagen und Anwendungsfälle rund um Liefermodelle – Private und Public Cloud – und Servicemodelle – IaaS, SaaS und PaaS – der Cloud-Technologien. Darüber hinaus geben sie Handlungsempfehlungen für die Nutzung der Cloud, die als Input für weitere Forschung dienen und Anwender bei der Strategiefindung unterstützen.