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U-Closure Operators and Compactness

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Abstract

A notion of compactness with respect to a previously introduced notion of functor induced closure operator is presented and analyzed. Even though this new notion shows very similar properties to compactness with respect to the classical notion of categorical closure operator, in general the two concepts are different. Examples are provided.

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References

  1. Adámek, J., Herrlich, H. and Strecker, G. E.: Abstract and Concrete Categories, Wiley, New York, 1990.

    MATH  Google Scholar 

  2. Castellini, G.: Categorical Closure Operators, Birkhäuser, Boston, 2003.

    MATH  Google Scholar 

  3. Castellini, G. and Giuli, E.: Closure operators with respect to a functor, Appl. Categ. Structure 9 (2001), 525–537.

    Article  MATH  MathSciNet  Google Scholar 

  4. Clementino, M. M., Giuli, E. and Tholen, W.: Topology in a category: Compactness, Portugal. Math. 43(4) (1996), 397–433.

    MathSciNet  Google Scholar 

  5. Castellini, G. and Strecker, G. E.: Global closure operators vs. subcategories, Quaestiones Math. 13 (1990), 417–424.

    Article  MathSciNet  MATH  Google Scholar 

  6. Dikranjan, D. and Giuli, E.: Closure operators I, Topology Appl. 27 (1987), 129–143.

    Article  MATH  MathSciNet  Google Scholar 

  7. Dikranjan, D. and Tholen, W.: Categorical Structure of Closure Operators, with Applications to Topology, Algebra and Discrete Mathematics, Kluwer, Dordrecht, 1995.

    MATH  Google Scholar 

  8. Dikranjan, D. and Uspenskij, V. V.: Categorically compact topological groups, J. Pure Appl. Algebra 126 (1998), 149–168.

    Article  MATH  MathSciNet  Google Scholar 

  9. Freyd, P. J. and Kelly, J. M.: Categories of continuous functors, I, J. Pure Appl. Algebra 2 (1972), 169–191. Erratum ibid. 4 (1974), 121.

    Article  MathSciNet  MATH  Google Scholar 

  10. Giuli, E.: On classes of T 0 spaces admitting completions, Appl. Gen. Topol. 1(1) (2003), 143–155.

    MathSciNet  Google Scholar 

  11. Herrlich, H.: Topological functors, Topology Appl. 4 (1974), 125–142.

    Article  MathSciNet  Google Scholar 

  12. Herrlich, H. and Strecker, G. E.: Category Theory, 2nd ed., Helderman Verlag, Berlin, 1979.

    MATH  Google Scholar 

  13. Tholen, W.: Factorizations, localizations and the orthogonal subcategory problem, Math. Nachr. 114 (1983), 63–85.

    Article  MATH  MathSciNet  Google Scholar 

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Correspondence to G. Castellini.

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Castellini, G., Giuli, E. U-Closure Operators and Compactness. Appl Categor Struct 13, 453–467 (2005). https://doi.org/10.1007/s10485-005-9001-8

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  • DOI: https://doi.org/10.1007/s10485-005-9001-8

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