Artigos de investigação / Research Papers

• On the categorical meaning of Hausdorff and Gromov distances, I  (with Andrei Akhvlediani and Walter Tholen).
  Topology and its Applications, available on line, doi:10.1016/j.topol.2009.06.018/.
  Abstract
     
  
• Lawvere completeness in topology (with Dirk Hofmann).
  Applied Categorical Structures 17 (2009) 175-210. Abstract
    
• Exponentiable functors between quantaloid-enriched categories (with Dirk Hofmann and Isar Stubbe).
  Applied Categorical Structures 17 (2009) 91-101. Abstract
   
  
• Relative injectivity as cocompleteness for a class of distributors (with Dirk Hofmann).
  Theory and Applications of Categories 21 (2009), 210-230. Abstract
    
  
• Protolocalisations of homological categories (with Francis Borceux, Marino Gran and Lurdes Sousa).
  Journal of Pure and Applied Algebra 212 (2008) 1898–1927. Abstract
    
• On some special classes of continuous maps (with Dirk Hofmann).
  Chapter 39, Part 4, of  Open Problems in Topology 2, pages 367-376, edited by Elliott Pearl, Elsevier 2007. Abstract
   
  
• Torsion theories and radicals  in normal categories (with D. Dikranjan and W. Tholen),  
    Journal of Algebra 305 (2006) 98-129. Abstract
   
  
• Topological protomodular algebras (with F. Borceux),  
   Topology and its Applications 153 (2006) 3085-3100. Abstract
   
  
• Exponentiation in V-categories (with D. Hofmann),  
   Topology and its Applications 153 (2006) 3113-3128. Abstract
    
• Topological semi-abelian algebras  (with F. Borceux),  
   Advances in Mathematics 190 (2005) 425-453.  Abstract
    
•  Local homeomorphisms via ultrafilter convergence  (with Dirk Hofmann and George Janelidze),  
   Proceedings of the American Mathematical Society 133 (2005), 917-922. Abstract
      
• Effective descent morphisms in categories of lax algebras   (with Dirk Hofmann),  
   Applied Categorical Structures 12 (2004) 413-425. Abstract
    
• On extensions of lax monads  (with D. Hofmann),  
    Theory and Applications of Categories 13 (2004) 41-60. Abstract
    
• One setting for all: metric, topology, uniformity, approach structure (with Dirk Hofmann and Walter Tholen),    
    Applied Categorical Structures 12 (2004) 127-154. Abstract   
    
  
•  A Functional Approach to General Topology (with Eraldo Giuli and Walter Tholen), in:   
    Categorical Foundations. Special Topics in Order, Topology, Algebra, and Sheaf Theory,   
    Encyclopedia of Mathematics and its Applications 97, Cambridge University Press (2004), pp. 103-163.
    
• Exponentiability in categories of lax algebras   (with Dirk Hofmann and Walter Tholen),
  Theory and Applications of Categories 11 (2003) 337-352. Abstract
  

• Metric, Topology and Multicategory - A Common Approach (with Walter Tholen)
Journal of Pure and Applied Algebra 179 (2003) 13-47. Abstract
 
• Topological features of lax algebras (with Dirk Hofmann),
Applied Categorical Structures 11 (2003) 267-286. Abstract
 
• The convergence approach to exponentiable maps (with Dirk Hofmann and Walter Tholen),
Portugaliæ Mathematica 60 (2003) 139-160. Abstract
 
• On limit stability of special classes of continuous maps (with Dirk Hofmann),
Topology and its Applications 125 (2002) 471-488. Abstract
 
• Triquotient maps via ultrafilter convergence (with Dirk Hofmann),
Proceedings of the American Mathematical Society 130 (2002) 3423-3431. Abstract
 
• On finite triquotient maps,
Journal of Pure and Applied Algebra 168 (2002) 387-389. Abstract
 
• A note on local compactness (with W. Tholen),
Rendiconti dell'Istituto di Matematica dell'Universita di Trieste, Suppl. 2, XXXII (2001) 17-31. Abstract
 
• On connectedness via closure operators ,
Applied Categorical Structures 9 (2001) 539-556. Abstract
 
• What is a quotient map with respect to a closure operator? (with E. Giuli and W. Tholen),
Applied Categorical Structures 9 (2001) 139-151. Abstract
 
• Separated and connected maps (with W. Tholen),
Applied Categorical Structures 6 (1998) 373-401. Abstract
 
• A Characterization of the Vietoris Topology (with W. Tholen),
Topology Proceedings 22 (1997) 71-95. Abstract
 
• Separation versus connectedness (with W. Tholen),
Topology and its Applications 75 (1997) 143-181. Abstract
 
• Tychonoff's Theorem in a Category (with W. Tholen),
Proceedings of the American Mathematical Society 124 (1996) 3311-3314. Abstract
 
• Topology in a Category: Compactness (with E. Giuli and W. Tholen),
Portugaliæ Mathematica 53 (1996) 397-433. Abstract
 
• On categorical notions of compact object ,
Applied Categorical Structures 4 (1996) 15-29. Abstract
 
• Constant morphisms and constant subcategories ,
Applied Categorical Structures 3 (1995) 119-137. Abstract
 
• On connectedness and disconnectedness ,
in: Topology with Applications (Szekszard, Hungary, 1993)
Mathematical Studies 4 (Bolyai Society), pgs. 71-82. Abstract
 
• Weakly hereditary regular closure operators ,
Topology and its Applications 49 (1993) 129-139. Abstract
 
• Hausdorff separation in categories,
Applied Categorical Structures 1 (1993) 285-295. Abstract
 
• T0- and T1-reflections,
Comment. Mathematicae Universitatis Carolinae 33 (1992) 493-504. Abstract