Abstract
Products of locales (generalized spaces) are coproducts of frames. Because of the algebraic nature of the latter they are often viewed as algebraic objects without much topological connotation. In this paper we first analyze the frame construction emphasizing its tensor product carrier. Then we show how it can be viewed topologically, that is, in the sum-of-the-open-rectangles perspective. The main aim is to present the product from different points of view, as an algebraic and a geometric object, and persuade the reader that both of them are fairly transparent.
References
[1] BANASCHEWSKI, B.-NELSON, E.: Tensor products and bimorphisms, Canad. Math. Bull. 19 (1976), 385-402.10.4153/CMB-1976-060-2Search in Google Scholar
[2] BANASCHEWSKI, B.-PULTR, A.: Cauchy points of metric locales, Canad. J. Math. 41 (1989), 830-854.10.4153/CJM-1989-038-0Search in Google Scholar
[3] BANASCHEWSKI, B.-PULTR, A.: Distributive algebras in linear categories, Algebra Universalis 30 (1993), 101-118.10.1007/BF01196553Search in Google Scholar
[4] BORCEUX, F.: Handbook of Categorical Algebra. Encyclopedia Math. Appl. 1, Cambridge University Press, Cambrige, 1994.10.1017/CBO9780511525858Search in Google Scholar
[5] DOWKER, C. H.-STRAUSS, D.: Sums in the category of frames, Houston J. Math. 3 (1977), 17-32.Search in Google Scholar
[6] HOFMANN, K. H.-LAWSON, J. D.: The spectral theory of distributive continuous lattices, Trans. Amer. Math. Soc. 246 (1978), 285-310.10.1090/S0002-9947-1978-0515540-7Search in Google Scholar
[7] ISBELL, J. R.: Atomless parts of spaces, Math. Scand. 31 (1972), 5-32.10.7146/math.scand.a-11409Search in Google Scholar
[8] ISBELL, J. R.: Product spaces in locales, Proc. Amer. Math. Soc. 81 (1981), 116-118.10.1090/S0002-9939-1981-0589150-5Search in Google Scholar
[9] ISBELL, J. R.-KŘÍŽ, I.-PULTR, A.-ROSICKÝ, J.: Remarks on localic groups. In: Categorical Algebra and its Applications (F. Borceux, ed.). Lecture Notes in Math. 1348, Springer, Berlin, pp. 154-172.Search in Google Scholar
[10] JOHNSTONE, P. T.: Stone Spaces. Cambridge Stud. Adv. Math. 3, Cambridge University Press, Cambridge, 1982.Search in Google Scholar
[11] JOYAL, A.-TIERNEY, M.: An extension of the Galois theory of Grothendieck. Mem. Amer. Math. Soc. 51 (1984), No. 309.Search in Google Scholar
[12] KŘÍŽ, I.-PULTR, A.: Products of locally connected locales, Rend. Circ. Mat. Palermo (2) Suppl. 11 (1985), 61-70.Search in Google Scholar
[13] KŘÍŽ, I.-PULTR, A.: Peculiar behaviour of connected locales, Cah. Topol. Géom. Différ. Catég. 30 (1989), 25-43.Search in Google Scholar
[14] PICADO, J.: Weil uniformities for frames, Comment. Math. Univ. Carolin. 36 (1995), 357-370.Search in Google Scholar
[15] PICADO, J.-PULTR, A.: Frames and Locales. Topology without Points. Front. Math. 28, Springer, Basel, 2012.10.1007/978-3-0348-0154-6Search in Google Scholar
[16] PICADO, J.-PULTR, A.: Entourages, covers and localic groups, Appl. Categ. Structures 21 (2013), 49-66.10.1007/s10485-011-9254-3Search in Google Scholar
[17] PLEWE, T.: Localic products of spaces, Proc. Lond. Math. Soc. (3) 73 (1996), 642-678.10.1112/plms/s3-73.3.642Search in Google Scholar
[18] PULTR, A.: Frames. In: Handb. Algebr. 3 (M. Hazewinkel, ed.), Elsevier/North-Holland, Amsterdam, 2003, pp. 791-857.10.1016/S1570-7954(03)80073-6Search in Google Scholar
[19] PULTR, A.-TOZZI, A.: Completion and coproducts of nearness frames. In: Symposium on Categorical Topology, Univ. Cape Town, Rondebosch, 1999, pp. 177-186. Search in Google Scholar
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Articles in the same Issue
- Complexities of Relational Structures
- Notes on the Product of Locales
- Free Objects and Free Extensions in the Category of Frames
- More on Uniform Paracompactness in Pointfree Topology
- Nonmeasurable Cardinals and Pointfree Topology
- Pseudocompact σ-Frames
- Torsion Radicals and Torsion Classes of Cyclically Ordered Groups
- Generalized Commutativity of Lattice-Ordered Groups
- The Relatively Uniform Completion, Epimorphisms and Units, in Divisible Archimedean L-Groups
- Polymorphism-Homogeneous Monounary Algebras
- αcc-Baer Rings
- Pushout Invariance Revisited
- Testing Statistical Hypotheses in Singular Weakly Nonlinear Regression Models
Articles in the same Issue
- Complexities of Relational Structures
- Notes on the Product of Locales
- Free Objects and Free Extensions in the Category of Frames
- More on Uniform Paracompactness in Pointfree Topology
- Nonmeasurable Cardinals and Pointfree Topology
- Pseudocompact σ-Frames
- Torsion Radicals and Torsion Classes of Cyclically Ordered Groups
- Generalized Commutativity of Lattice-Ordered Groups
- The Relatively Uniform Completion, Epimorphisms and Units, in Divisible Archimedean L-Groups
- Polymorphism-Homogeneous Monounary Algebras
- αcc-Baer Rings
- Pushout Invariance Revisited
- Testing Statistical Hypotheses in Singular Weakly Nonlinear Regression Models