1. John A. Hildebrant (1935–2003)

   • Jimmie Lawson
   • Karen Aucoin

   Obituary 01 April 2004 Pages: 317 - 321

2. Fourier Algebras on Topological Foundation *-Semigroups.

   • Massoud Amini
   • Alireza Medghalchi

   Research Article 01 April 2004 Pages: 322 - 334

3. Abelian Kernels of Monoids of Order-preserving Maps and of Some of Its Extensions

   • Manuel Delgado
   • Vítor H. Fernandes

   Research Article 01 April 2004 Pages: 335 - 356

4. Some Remarks on Some Second-order Hyperbolic Differential Equations

   • Toka Diagana

   Research Article 01 April 2004 Pages: 357 - 364

5. Zebra Factorizations in Free Semigroups

   • Andrzej Ehrenfeucht
   • Tero Harju
   • Grzegorz Rozenberg

   Research Article 01 April 2004 Pages: 365 - 372

6. Descending Chains of Modules and Jordan–Hölder Theorem

   • Luca Diracca
   • Alberto Facchini

   Research Article 01 April 2004 Pages: 373 - 399

7. Subsemigroups of Completely Simple Semigroups and Weak Convergence of Convolution Products of Probability Measures

   • Gregory Budzban
   • Arunava Mukherjea

   Research Article 01 April 2004 Pages: 400 - 410

8. On the Continuity of Inversion in Countably Compact Inverse Topological Semigroups

   • Taras O. Banakh
   • Oleg V. Gutik

   Research Article 01 April 2004 Pages: 411 - 418

9. A Semilinear Structure on Semigroups in a Metric Space

   • Rinaldo M. Colombo
   • Andrea Corli

   Research Article 01 April 2004 Pages: 419 - 444

10. Identity Bases for Some Non-exact Varieties

    • Edmond W. H. Lee

    Research Article 01 April 2004 Pages: 445 - 457

11. Ordered Groupoids and Left Cancellative Categories

    • Mark V. Lawson

    Research Article 01 April 2004 Pages: 458 - 476

12. On n-Central Semigroups

    • Primoz Moravec

    Research Article 01 April 2004 Pages: 477 - 487

13. The Equation xⁱ = y^jz^k in a Free Semigroup

    • Tero Harju
    • Dirk Nowotka

    Research Article 01 April 2004 Pages: 488 - 490

14. Asymptotics of Resolvent Iterates for Abstract Potentials

    • Shmuel Kantorovitz

    Short Note 01 April 2004 Pages: 491 - 494