1. Schrödinger Operators with Singular Complex Potentials as Generators: Existence and Stability

   • V. Liskevich
   • P. Stollmann

   Pages: 337 - 343

2. The Embedding of Some Ordered Semigroups into Ordered Groups

   • N. Kehayopulu
   • M. Tsingelis

   Pages: 344 - 350

3. A Class of Idempotent Semirings

   • M. K. Sen
   • Y. Q. Guo
   • K. P. Shum

   Pages: 351 - 367

4. TK-operator Semigroups for Cryptogroups

   • L.-M. Wang

   Pages: 368 - 384

5. On the Semigroup of Q-monotone Symplectic Operators

   • Y. Chae
   • Y. Lim

   Pages: 385 - 395

6. Preorderings on Semigroups and Semirings of Right Quotients

   • J. Cimpric

   Pages: 396 - 404

7. All 2-Solid Varieties of Semigroups

   • J. Koppitz

   Pages: 405 - 423

8. Trace-kernel-operator Semigroups of Bisimple omega-Semigroups

   • L.-M. Wang

   Pages: 424 - 435

9. Commutative Rings with Finitely Generated Multiplicative Semigroup

   • D.D. Anderson
   • J. Stickles

   Pages: 436 - 443

10. On D0L and HDT0L Sets in Monoids

    • J. Honkala

    Pages: 444 - 449

11. Free Products of Pseudocomplemented Semilattices

    • T. Katrinák
    • Z. Heleyová

    Pages: 450 - 469

12. Finite L-trivial Transformation Semigroups

    • T. Saito

    Pages: 470 - 477

13. The Lie-Trotter Product Formula Does not Hold for Arbitrary Sums of Generators

    • F. Kühnemund
    • M. Wacker

    Pages: 478 - 485

14. All Automorphisms of FP ⁺(S _n ) are Inner

    • V. Mazorchuk

    Pages: 486 - 490