1. Injective hulls are not natural

   • Jiří Adámek
   • Horst Herrlich
   • Walter Tholen

   Regular article Pages: 379 - 388

2. Projective semimodules

   • Olga Sokratova

   Regular article Pages: 389 - 398

3. A Cantor-Bernstein type theorem for effect algebras

   • Gejza Jenča

   Regular article Pages: 399 - 411

4. Self-dual lattice identities

   • David Kelly
   • R. Padmanabhan

   Regular article Pages: 413 - 426

5. A coalgebraic approach to quasigroup permutation representations

   • Jonathan D. H. Smith

   Regular article Pages: 427 - 438

6. A survey of recent results on congruence lattices of lattices

   • Jiří Tuma
   • Friedrich Wehrung

   Regular article Pages: 439 - 471

7. Permutability of rules in lattice theory

   • Sara Negri
   • Jan von Plato

   Regular article Pages: 473 - 477

8. Flat and weakly flat projection algebras

   • M. Mehdi Ebrahimi
   • M. Mahmoudi

   Regular article Pages: 479 - 484

9. Order-coherent Archimedean f-algebras

   • Marjan Jerman

   Regular article Pages: 485 - 496

10. Mailbox¶Boolean products of indecomposables

    • Stanley Burris

    Regular article Pages: 497 - 499