1. Defect theorems with compatibility relations

   • Vesa Halava
   • Tero Harju
   • Tomi Kärki

   Research article 18 October 2007 Pages: 1 - 24

2. Limitations on the size of semigroups of matrices

   • Heydar Radjavi
   • Peter Rosenthal

   RESEARCH ARTICLE 06 September 2007 Pages: 25 - 31

3. Associativity of the ∇-operation on bands in rings

   • Karin Cvetko-Vah
   • Jonathan Leech

   Research Article 15 September 2007 Pages: 32 - 50

4. Sparse and slender subsets of monoids

   • Juha Honkala

   Research article 18 September 2007 Pages: 51 - 57

5. Frequency modules and nonexistence of quasi-periodic solutions of nonlinear evolution equations

   • Amin Boumenir
   • Nguyen Van Minh
   • Vu Kim Tuan

   Research article 06 October 2007 Pages: 58 - 70

6. Naturally ordered regular semigroups with an inverse monoid transversal

   • T. S. Blyth
   • M. H. Almeida Santos

   Research Article 06 September 2007 Pages: 71 - 86

7. Some conditions related to the exactness of Rees-Sushkevich varieties

   • S. I. Kublanovsky
   • Edmond W. H. Lee
   • Norman R. Reilly

   Research Article 06 September 2007 Pages: 87 - 94

8. Strongly and weakly almost periodic linear maps on semigroup algebras

   • Ali Ghaffari

   Research article 05 September 2007 Pages: 95 - 106

9. Regular congruences on an E-inversive semigroup

   • Yanfeng Luo
   • Xingkui Fan
   • Xiaoling Li

   Research article 13 October 2007 Pages: 107 - 123

10. Polynomials hardly commuting with increasing bijections

    • V. Kannan
    • B. Sankararao
    • S. Niketa Salvi

    Research article 20 November 2007 Pages: 124 - 132

11. A note on sensitivity of semigroup actions

    • Eduard Kontorovich
    • Michael Megrelishvili

    Research article 13 November 2007 Pages: 133 - 141

12. Analytic solutions of Volterra equations via semigroups

    • Tomáš Bárta

    Research article 18 October 2007 Pages: 142 - 148

13. Opial type inequalities for cosine and sine operator functions

    • George A. Anastassiou

    Research article 17 October 2007 Pages: 149 - 158

14. Two-letter group codes that preserve aperiodicity of inverse finite automata

    • Jean-Camille Birget
    • Stuart W. Margolis

    Research article 18 October 2007 Pages: 159 - 168

15. Classification of monoids by injectivities I. C-injectivity

    • Xia Zhang
    • Ulrich Knauer
    • Yuqun Chen

    Research article 16 October 2007 Pages: 169 - 176

16. Classification of monoids by injectivities II. CC-injectivity

    • Xia Zhang
    • Ulrich Knauer
    • Yuqun Chen

    Research article 16 October 2007 Pages: 177 - 184