1. Editorial

   • R. Lowen

   EditorialNotes Pages: v - vi

2. Some open categorical problems inTop

   • Horst Herrlich
   • Miroslav Hušek

   OriginalPaper Pages: 1 - 19

3. Categorical principles, techniques and results for high-level-replacement systems in computer science

   • Hartmut Ehrig
   • Michael Löwe

   OriginalPaper Pages: 21 - 50

4. Differential calculus founded on an isomorphism

   • L. D. Nel

   OriginalPaper Pages: 51 - 57

5. Lexicographic sums and fibre-faithful maps

   • Reinhard Börger
   • Walter Tholen
   • Anna Tozzi

   OriginalPaper Pages: 59 - 83

6. Finite-product-preserving functors, Kan extensions, and strongly-finitary 2-monads

   • G. M. Kelly
   • Stephen Lack

   OriginalPaper Pages: 85 - 94

7. Coinverters and categories of fractions for categories with structure

   • G. M. Kelly
   • Stephen Lack
   • R. F. C. Walters

   OriginalPaper Pages: 95 - 102

8. Galois theory in variable categories

   • George Janelidze
   • Dietmar Schumacher
   • Ross Street

   OriginalPaper Pages: 103 - 110

9. CompactT ₀-spaces andT ₀-compactifications

   • Horst Herrlich

   OriginalPaper Pages: 111 - 132