Balibrea, Francisco; Cánovas, J.S.; Linero, A.(Universitat Politècnica de València, 2001-04-01)
[EN] We present some results concerning the topological dynamics of antitriangular maps, F:X2→ X2 with the formvF(x,y)=(g(y),f(x)), where (X,d) is a compact metric space and f,g : X→ X are continuous maps. We make an special ...
Vidal, Anna(Universitat Politècnica de València, 2001-04-01)
[EN] In this paper we prove fixed point theorems for countable families of fuzzy mappings satisfying contractive-type conditions and a rational inequality in left K-sequentially complete quasi-pseudo-metric spaces. These ...
Bella, Angelo; Malykhin, V.I.(Universitat Politècnica de València, 2001-04-01)
[EN] Answering a question of A.V. Arhangel'skii, we show that any extremally disconnected subspace of a compact space with countable tightness is discrete.
Bosi, Gianni; Isler, Romano(Universitat Politècnica de València, 2001-04-01)
[EN] Given a compact metric space (X, d), and its Borel σ-algebra Σ, we discuss the existence of a (semi)continuous utility function U for a complete preorder ≤ on a subset M’(X) of the space M(X) of all upper-continuous ...
Rodríguez-López, Jesús(Universitat Politècnica de València, 2001-04-01)
[EN] We study the double Fell topology when this hypertopology is constructed over a quasi-pseudo-metric space. In particular, its relationship with the Wijsman hypertopology is studied. We also propose an extension of the ...