Series Forward                                                  vii

Introduction                                                      1

  I Objects and Subtypes

  1. User-Defined Types and Procedural Data Structures as
     Complementary Approaches to Data Abstraction                13
     John C. Reynolds

  2. Using Category Theory to Design Implicit Conversions
     and Generic Operators                                       25
     John C. Reynolds

 II Type Inference                                               65

  3. Type Inference for Records in a Natural Extension of ML
     Didier Re'my                                                67

  4. Type Inference for Objects with Instance Variables and
     Mitchell Wand                                               97

  5. Static Type Inference for Parametric Classes
     Atsushi Ohori and Peter Buneman                            121

III Coherence                                                   149

  6. A Modest Model of Records, Inheritance and
     Bounded Quantification
     Kim Bruce and Guiseppe Longo                               151

  7. Inheritance as Implicit Coercion
     Val Breazu-Tannen, Thierry Coquand, Carl A. Gunter,
     and Andre Scedrov                                          197

  8. Coherence of Subsumption, Minimum Typing and
     Type-Checking in F<=
     Pierre-Louis Curien and Giorgio Ghelli                     247

 IV Record Calculi                                              293

  9. Operations on Records
     Luca Cardelli and John C. Mitchell                         295

 10. Typing Record Concatenation for Free
     Didier Re'my                                               351

 11. Extensible Records in a Pure Calculus of Subtyping
     Luca Cardelli                                              373

 12. Bounded Quantification is Undecidable
     Benjamin C. Pierce                                         427

  V Inheritance                                                 461

 13. Two Semantic Models of Object-Oriented Languages
     Sam Kamin and Uday Reddy                                   463

 14. Inheritance is Not Subtyping
     William R. Cook, Walter L. Hill and Peter S. Canning       497

 15. Toward a Typed Foundation for Method Specialization 
     and Inheritance
     John C. Mitchell                                           519

Contributors                                                    547