Fixed-point theory on neighborhood retracts of convexoid spaces
Fix-finite approximation of n-valued multifunctions
Fix-finite approximation property in normed vector spaces.
Fixpoints Of Decreasing Mappings Of Ordered Sets
Fixpoints of decreasing mappings of ordered sets.
Fixpunkte in homogenen Räumen.
Fixpunktsätze für limeskompakte mengenwertige Abbildungen in nicht notwendig lokalkonvexen topologischen Vektorräumen
F-limit points in dynamical systems defined on the interval
Given a free ultrafilter p on ℕ we say that x ∈ [0, 1] is the p-limit point of a sequence (x n)n∈ℕ ⊂ [0, 1] (in symbols, x = p -limn∈ℕ x n) if for every neighbourhood V of x, {n ∈ ℕ: x n ∈ V} ∈ p. For a function f: [0, 1] → [0, 1] the function f p: [0, 1] → [0, 1] is defined by f p(x) = p -limn∈ℕ f n(x) for each x ∈ [0, 1]. This map is rarely continuous. In this note we study properties which are equivalent to the continuity of f p. For a filter F we also define the ω F-limit set of f at x. We consider...
Flow compactifications of nondiscrete monoids, idempotents and Hindman’s theorem
We describe the extension of the multiplication on a not-necessarily-discrete topological monoid to its flow compactification. We offer two applications. The first is a nondiscrete version of Hindman’s Theorem, and the second is a characterization of the projective minimal and elementary flows in terms of idempotents of the flow compactification of the monoid.
Flows and periodic motions
Flows in Networks and Hausdorff Measures Associated. Applications to Fractal Sets in Euclidian Space
Flows on Invariant Subsets and Compactifications of a Locally Compact Group
Flows on one-dimensional spaces
Flows with cyclic winding numbers groups.
Folgenkompaktheit und Auswahlaxiom
Fonctions séparément continues et de première classe sur un espace pruduit.
Fonctions séparément continues sur le produit de deux espaces polonais
Forcing countable networks for spaces satisfying
We show that all finite powers of a Hausdorff space do not contain uncountable weakly separated subspaces iff there is a c.c.c poset such that in is a countable union of -dimensional subspaces of countable weight. We also show that this...
Forcing tightness in products of fans
We prove two theorems that characterize tightness in certain products of fans in terms of families of integer-valued functions. We also define several notions of forcing that allow us to manipulate the structure of the set of functions from some cardinal θ to ω, and hence, the tightness of these products. These results give new constructions of first countable <θ-cwH spaces that are not ≤θ-cwH.
Foreword