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Artigos em Revistas Internacionais
Araújo, João
; Konieczny, Janusz (2007)
Automorphisms of Endomorphism Monoids of Relatively Free Bands
Proceedings of the Edinburgh Mathematical Society: 50, 1-21.
Branco, Mário J. J.
(2007)
Deterministic concatenation product of languages recognized by finite idempotent monoids
Semigroup Forum: 74, n. 3, 379-409.
Gomes, Gracinda M. S.
; Szendrei, Maria B. (2007)
Even covers of left ample semigroups
Semigroup Forum: 74(2), 293-305.
Couceiro, Miguel;
Lehtonen, Erkko
(2007)
On the effect of variable identification on the essential arity of functions on finite sets
Int. J. Found. Comput. Sci.: 18, 975-986.
Araújo, João
; Mitchell, James D. (2007)
Relative ranks in the monoid of endomorphisms of an independence algebra
Monatshefte für Mathematik: 151, 1-10.
Bentz, Wolfram
(2006)
A Characterization of Hausdorff Separation for a Special Class of Varieties
Algebra Universalis: 55, 259 – 276.
Couceiro, Miguel; Foldes, Stephan;
Lehtonen, Erkko
(2006)
Composition of Post classes and normal forms of Boolean functions
Discrete Math.: 306, 3223-3243.
Lehtonen, Erkko
(2006)
Descending chains and antichains of the unary, linear, and monotone subfunction relations
Order: 23, 129-142.
Fountain, John B.;
Gomes, Gracinda M. S.
(2006)
Finite abundant semigroups in which the idempotents form a subsemigroup
Journal of Algebra: 295, 303-313.
Araújo, João
(2006)
Lifts for Semigroups of Endomorphisms of an Independence Algebra
Colloquium Mathematicum: 106, 39-56.
Gomes, Gracinda M. S.
; Pin, J.-E.; Sezinando, Helena (2006)
Presentations of the Schützenberger product of n groups
Communications in Algebra: 34 (4), 1213-1235.
Fountain, J.B.;
Gomes, Gracinda M. S.
(2006)
Proper covers of ample monoids
Proc. Edinb. Math. Soc.: 49, 277-289.
Gomes, Gracinda M. S.
(2006)
The generalized prefix expansion of a weakly left ample semigroup
Semigroup Forum: 72 (3), 387-403.
Branco, Mário J. J.
(2006)
Two algebraic approaches to variants of the concatenation product
Theoret. Comput. Sci.: 369, 406-426.
Araújo, João
; Fountain, John (2005)
A Description of Normal Semigroups of Endomorphisms of Proper Independence Algebras
Communications in Algebra: 33, 2705-2711.
Bordalo, Gabriela Hauser
(2005)
A note on essentially convex orders
Algebra Universalis: 53, 281-285.
Araújo, João
; Mitchell, James D. (2005)
An elementary proof that every singular matrix is a product of idempotent matrices
American Mathematical Monthly: 112 (7), 641-645.
Fernandes, Vítor Hugo;
Gomes, Gracinda M. S.
; Jesus, Manuel M. (2005)
Congruences on monoids of order-preserving or order-reversing transformations on a finite chain
Glasgow Mathematical Journal: 47, 413-424.
Araújo, João
; Konieczny, Janusz (2005)
Dense Relations Are Determined by Their Endomorphism Monoid
Semigroup Forum: 70, 2, 302-306.
Fernandes, Vítor Hugo;
Gomes, Gracinda M. S.
; Jesus, Manuel M. (2005)
Presentations for some monoids of partial transformations on a finite chain
Communications in Algebra: 33, 587-604.
Gomes, Gracinda M. S.
(2005)
Proper extensions of weakly left ample semigroups
Acta Math Hungarica: 109 (1-2), 33-51.
Araújo, João
; Silva, Fernando C. (2005)
Semigroups of Matrices Closed Under Conjugation by Normal Linear Groups
JP Journal of Algebra and Number Theory: 5 No.3, 535-545.
Auinger, K.;
Gomes, Gracinda M. S.
; Gould, V.; Steinberg, B. (2004)
An application of a theorem of Ash to finite proper cover
Studia Logica: 78, 45-57.
Santa-Clara, Catarina
; Smith, Patrick F. (2004)
Direct Products of Simple Modules Over Dedekind Domains
Archiv der Mathematik: 82, 8-12.
Gouveia, M. J.
; (previously Saramago, M. J.) (2004)
Optimal natural dualities: the role of endomorphisms
J. Australian Math. Soc.: 77, 269-296.
Fernandes, Vítor Hugo;
Gomes, Gracinda M. S.
; Jesus, Manuel M. (2004)
Presentations for Some Monoids of Injective Partial Transformations on a Finite Chain
Southeast Asian Bulletin of Mathematics: 28, 903-918.
Araújo, João
; Konieczny, Janusz (2004)
Semigroups of Transformations Preserving an Equivalence Relation and a Cross-Section
Communications in Algebra: 32, 1917-1935.
Araújo, João
; Konieczny, Janusz (2003)
Automorphisms Groups of Centralizers of Idempotents
Journal of Algebra: 269, 227-239.
Bordalo, Gabriela Hauser
; Monjardet, Bernard (2003)
Finite orders and their minimal strict completion lattices
Discussiones Mathematicae, General Algebra and Applications: 23, 85-100.
Gomes, Gracinda M. S.
; Gould, V. (2003)
Finite proper covers in a class of finite semigroups with commuting idempotents
Semigroup Forum: 66, 433-454.
Araújo, João
(2003)
Idempotent Generated Endomorphisms of an Independence Algebra
Semigroup Forum: 67, 464-467.
Araújo, João
(2003)
Lifts for Semigroups of Monomorphisms of an Independence Algebra
Colloquium Mathematicum: 97, 277-284.
Araújo, João
; Mitchell, James D.; Silva, N. (2003)
On embedding countable sets of endomorphisms
Algebra Universalis: 50, 61-67.
Galvão, M. Luísa
; Green, J. A.; Nogueira, Maria Teresa (2003)
Radical and Socle of an Algebra without element identity
Comm. Algebra: 31 (6), 2883-2907.
Araújo, João
(2002)
Generators for the Semigroup of Endomorphisms of an Independence Algebra
Algebra Colloquium: 9:4, 375-382.
Berman, Joel;
Bordalo, Gabriela Hauser
(2002)
Irreducible elements and uniquely generated algebras
Discrete Mathematics: 245, 63-79.
Araújo, João
; Konieczny, Janusz (2002)
Molaei's Generalized Groups are Completely Simple Semigroups
Bul. Inst. Politeh. Jassy, Sect. I. Mat. Mec. Teor. Fiz.: 48 (52) no. 1-2, 1-5.
Araújo, João
(2002)
Normal Semigroups of Endomorphisms of Proper Independence Algebras are Idempotent Generated
Proc. Edinburgh Math. Soc.: 45, 205-217.
Araújo, João
(2002)
On Idempotent Generated Semigroups
Semigroup Forum: 65, 138-140.
Gouveia, M. J.
; (previously Saramago, M. J.); Priestley, H. A. (2002)
Optimal natural dualities: the structure of failsets
Internat. J. Algebra and Computation: 12 (3), 407-436.
Bordalo, Gabriela Hauser
; Monjardet, B. (2002)
The lattice of strict completions of a finite poset
Algebra Universalis: 47, 183-200.
Gomes, Gracinda M. S.
; Gould, Victoria (2001)
Fundamental Ehresmann Semigroups
Semigroup Forum: 63 (1), 11-33.
Araújo, Isabel M.;
Branco, Mário J. J.
; Fernandes, Vítor Hugo;
Gomes, Gracinda M. S.
; Ruskuc, N. (2001)
On generators and relations for unions of semigroups
Semigroup Forum: 63 (1), 49-62.
Gomes, Gracinda M. S.
; Gould, Victoria (2000)
Graph expansions of unipotent monoids
Comm. Algebra: 28 (1), 447-463.
Santa-Clara, Catarina
; Smith, Patrick F. (2000)
Modules which are self-injective relative to closed submodules
Contemp. Math.: 259, 487-499.
Giraldes, Emília;
Gomes, Gracinda M. S.
; McAlister, D. B. (2000)
On a class of lattice ordered inverse semigroups
J. Algebra: 230, 496-517.
Fountain, John;
Gomes, Gracinda M. S.
(2000)
Primitive inverse congruences on categorical semigroups
Proc. Edinburgh Math. Soc.: 43, 395-413.
Araújo, João
; Silva, F. C. (2000)
Semigroups of linear endomorphisms closed under conjugation
Comm. Algebra: 28 (8), 3679-3689.
Gouveia, M. J.
; (previously Saramago, M. J.) (2000)
Some remarks on dualisability and endodualisability
Algebra Universalis: 43, 197-212.
Fountain, John;
Gomes, Gracinda M. S.
; Gould, Victoria (1999)
A Munn type representation for a class of E-semiadequate semigroups
J. Algebra: 218, 693-714.
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CEMAT
- Center for Computational and Stochastic Mathematics
Instituto Superior Têcnico
Faculdade de Ciências
Universidade de Lisboa