Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: Q-set

Sortuj według:

Ogranicz wyniki do:

Almost disjoint families and property (a)

100%

Szeptycki P. J., Vaughan J. E.

Fundamenta Mathematicae

1998

tom 158

nr 3

229-240

We consider the question: when does a Ψ-space satisfy property (a)? We show that if $|A| < \got p$ then the Ψ-space Ψ(A) satisfies property (a), but in some Cohen models the negation of CH holds and every uncountable Ψ-space fails to satisfy property (a). We also show that in a model of Fleissner and Miller there exists a Ψ-space of cardinality $\got p$ which has property (a). We extend a theorem of Matveev relating the existence of certain closed discrete subsets with the failure of property (a).

Ograniczanie wyników

1 Fundamenta Mathematicae

1 Szeptycki P. J.

1 Vaughan J. E.

1 1998

Wyniki wyszukiwania

Almost disjoint families and property (a)