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Cantor manifolds in the theory of transfinite dimension

Wojciech Olszewski (1994)

Fundamenta Mathematicae

For every countable non-limit ordinal α we construct an α-dimensional Cantor ind-manifold, i.e., a compact metrizable space Z α such that i n d Z α = α , and no closed subset L of Z α with ind L less than the predecessor of α is a partition in Z α . An α-dimensional Cantor Ind-manifold can be constructed similarly.

Cantor-connectedness revisited

Robert Lowen (1992)

Commentationes Mathematicae Universitatis Carolinae

Following Preuss' general connectedness theory in topological categories, a connectedness concept for approach spaces is introduced, which unifies topological connectedness in the setting of topological spaces, and Cantor-connectedness in the setting of metric spaces.

Caratterizzazione dei Γ -limiti d'ostacoli unilaterali

Placido Longo (1984)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni

In this paper we complete the characterization of those f , μ and ν such that w H 1 ( Ω ) 2 + B f ( x , w ( x ) ) d μ + ν ( B ) is Γ ( L 2 ( Ω ) - ) limit of a sequence of obstacles w H 1 ( Ω ) 2 + Φ h ( w , B ) where Φ h ( w , B ) = { 0 if w φ h a.e. o n B , + otherwise .

Cardinal inequalities implying maximal resolvability

Marek Balcerzak, Tomasz Natkaniec, Małgorzata Terepeta (2005)

Commentationes Mathematicae Universitatis Carolinae

We compare several conditions sufficient for maximal resolvability of topological spaces. We prove that a space X is maximally resolvable provided that for a dense set X 0 X and for each x X 0 the π -character of X at x is not greater than the dispersion character of X . On the other hand, we show that this implication is not reversible even in the class of card-homogeneous spaces.

Cardinal invariants and compactifications

Anatoly A. Gryzlov (1994)

Commentationes Mathematicae Universitatis Carolinae

We prove that every compact space X is a Čech-Stone compactification of a normal subspace of cardinality at most d ( X ) t ( X ) , and some facts about cardinal invariants of compact spaces.

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