JP Journal of Geometry and Topology
Volume 18, Issue 1, Pages 1 - 14
(August 2015) http://dx.doi.org/10.17654/JPGTAug2015_001_014 |
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ON CONTINUOUSLY TYPE q-CONTINUA
Sergio MacÃas
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Abstract: A continuum X is a q-continuum -continuum, for some positive integer n) if for each subcontinuum K of X, we have that only has a finite number of components has at most n components). Following Professor E. J. Vought, we say that q-continuum -continuum) is of type A provided that it admits a monotone upper semicontinuous decomposition whose quotient space is a finite graph, and it is of type if, in addition, the elements of the decomposition have empty interior. A q-continuum -continuum) of type for which the decomposition is continuous is a continuously type q-continuum -continuum). We characterize continuously type q-continua as those q-continua of type A for which the set function is continuous. We prove that each continuously type q-continuum is a -continuum for some positive integer n. We show that the n-fold symmetric product of a continuously type q-continuum, for which the elements of the decomposition are nondegenerate, is a Z-set in both the hyperspace of closed subsets of the continuum and the n-fold hyperspace of that continuum. |
Keywords and phrases: continuous decomposition, continuously type q-continuum, continuum, hyperspace, idempotency, Jones’ set function q-continuum, -continuum, type A q-continuum, type q-continuum, upper semicontinuous decomposition, weakly irreducible continuum, Whitney map, Z-set. |
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