Abstract Sets and Finite Ordinals

Preface Part I. The elements of set theory 1. The basic logical concepts 2. Operations on classes Part II. The Bernays theory of finite classes and finite sets Foreword Introduction 1. The basis of the system 2. The development of the system: stage I 3. The development of the system: stage II 4. The theory of finite ordinals 5. The theory of finite classes and finite sets References Index