Proceedings of the international conference semigroups and formal language,12-15 July 2005,Portugal / Edited by: Jorge M André (CAUL and Universidade Nova de Lisboa, Portugal), Vítor H Fernandes (CAUL and Universidade Nova de Lisboa, Portugal), Mário J J Branco (CAUL and Universidade de Lisboa, Portugal), Gracinda M S Gomes (CAUL and Universidade de Lisboa, Portugal), John Fountain (University of York, UK), John C Meakin (University of Nebraska-Lincoln, USA)

A Note on Finitely Generated Semigroups of Regular Languages (S Afonin andamp; E Khazova) Complete Reducibility of Pseudovarieties (J Almeida and others) Finite Generation of Semigroups with Almost nvariant Idempotents (C A Carvalho) Open Problems on Regular Languages: A Historical Perspective (L Chaubard andamp; J-É Pin) Solving Systems of Equations Modulo Pseudovarieties of Abelian Groups and Hyperdecidability (M Delgado and others) Finite Residue Class Rings of Integers Modulo n</i> from the Viewpoint of Global Semigroup Theory (A Egri-Nagy andamp; C L Nehaniv) A Theorem for Ordered Groupoids (N D Gilbert) On the Finite Basis Problem for the Monoids of Extensive Transformations (I A Goldberg) A Freiheitssatz for Subsemigroups of One-Relator Groups with Small Cancellation Condition (A Juhász) Wreath Product Decompositions for Triangular Matrix Semigroups (M Kambites andamp; B Steinberg) In McAlister's Footsteps: A Random Ramble Around the Theorem (M V Lawson andamp; S W Margolis) On the Structure of the Lattice of Combinatorial Rees–Sushkevich Varieties (E W H Lee andamp; M V Volkov) On Trivializers and Subsemigroups (A Malheiro) Semilattice Ordered Inverse Semigroups (D B McAlister) Isomorphism Problems for Transformation Semigroups (S Mendes-Gonçalves) On McAlister's Monoid and Its Contracted Algebra (W D Munn) Relative Monoid Presentations and Finite Derivation Type (F Otto) Literal Varieties and Pseudovarieties of Homomorphisms onto Abelian Groups (L Polák)