1. From the editors

   • M. E. Adams
   • K. V. Adaricheva
   • A. V. Kravchenko

   EditorialNotes Pages: 3 - 5

2. On quasivarieties and varieties as categories

   • Jiří Adámek

   OriginalPaper Pages: 7 - 33

3. On the structure of lattices of subquasivarieties of congruence-noetherian quasivarieties

   • K. V. Adaricheva
   • V. A. Gorbunov

   OriginalPaper Pages: 35 - 44

4. An application of a Theorem of Ash to finite covers

   • Karl Auinger
   • Gracinda M. S. Gomes
   • Benjamin Steinberg

   OriginalPaper Pages: 45 - 57

5. Fragments of R-Mingle

   • W. J. Blok
   • J. G. Raftery

   OriginalPaper Pages: 59 - 106

6. Dominions in quasivarieties of universal algebras

   • Alexander Budkin

   OriginalPaper Pages: 107 - 127

7. Algebraic theory of quasivarieties of heterogeneous partial algebras

   • Peter Burmeister

   OriginalPaper Pages: 129 - 153

8. Implicit connectives of algebraizable logics

   • Xavier Caicedo

   OriginalPaper Pages: 155 - 170

9. Fregean logics with the multiterm deduction theorem and their algebraization

   • J. Czelakowski
   • D. Pigozzi

   OriginalPaper Pages: 171 - 212

10. Applications of Priestley duality in transferring optimal dualities

    • Brian A. Davey
    • Miroslav Haviar

    OriginalPaper Pages: 213 - 236

11. A non-finitely based quasi-variety of De Morgan algebras

    • Hernando Gaitán
    • Milton H. Perea

    OriginalPaper Pages: 237 - 248

12. Quasi-varieties: A special access

    • Hans-Jürgen Hoehnke

    OriginalPaper Pages: 249 - 260

13. On subdirectly irreducible OMAs

    • Richard Holzer

    OriginalPaper Pages: 261 - 277

14. On relative universality and Q-universality

    • V. Koubek
    • J. Sichler

    OriginalPaper Pages: 279 - 291

15. Finite basis problems and results for quasivarieties

    • Miklós Maróti
    • Ralph McKenzie

    OriginalPaper Pages: 293 - 320

16. Quasivarieties of cancellative commutative binary modes

    • K. Matczak
    • A. Romanowska

    OriginalPaper Pages: 321 - 335

17. Finite quasivarieties and self-referential conditions

    • Alexei Vernitski

    OriginalPaper Pages: 337 - 348

18. Checking quasi-identities in a finite semigroup may be computationally hard

    • M. V. Volkov

    OriginalPaper Pages: 349 - 356

19. Open questions related to the problem of Birkhoff and Maltsev

    • M. E. Adams
    • K. V. adaricheva
    • A. V. Kravchenko

    OriginalPaper Pages: 357 - 378