On the shape category of compacta



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Rodríguez Sanjurjo, José Manuel (1986) On the shape category of compacta. Journal of the London Mathematical Society. Second Series, 34 (Part 3). pp. 559-567. ISSN 0024-6107

Official URL: http://jlms.oxfordjournals.org/content/s2-34/3/559.short


K. Borsuk [Fund. Math. 99 (1978), no. 1, 35–42] extended the classical notion of Lyusternik-Shnirelman category (briefly L-S category) to the theory of shape and thereby introduced a shape invariant coefficient for a compactum X . This was subsequently generalized for all topological spaces by V. V. Agaronyan and Yu. M. Smirnov [Soviet Math. Dokl. 20 (1979), no. 3, 516–518] and Z. Čerin [Houston J. Math. 5 (1979), no. 2, 169–182]. The author studies the shape L-S category of compacta and proves, among other things, that the coefficients of two compacta are equal provided there exists a refinable map between them. A new shape invariant called "the coefficient of movability'' is given and some of its properties for shape fibrations are studied. Some properties of Borsuk's coefficient λ(X) introduced in his aforementioned paper are given. Several relations, equalities and inequalities, between these coefficients are also given.

Item Type:Article
Uncontrolled Keywords:Shape theory
Subjects:Sciences > Mathematics > Geometry
Sciences > Mathematics > Topology
ID Code:17124
Deposited On:16 Nov 2012 09:23
Last Modified:12 Dec 2018 15:14

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