Tres cardinais invariantes topologicos

AUTOR(ES)

Elizabeth Terezinha Gasparim

DATA DE PUBLICAÇÃO

1989

RESUMO

In this work we study the concepts of tightness, set-tightness and T-tightness. We investigate the behavior of tightness under Alexandroff and Stone-Cech compactifications, in some specific examples. We calculate tightness, T-tighness, T-tightness and set-tightness for some product spaces and prove spaces and prove the following result: If X and Y are topological spaces, then ts(X x Y) min , it follows that for a meretrizable space X: ts(X x Y) = ts(Y) for any space Y. An analogous result is showed for tightness

ASSUNTO(S)

invariantes numeros cardinais espaços topologicos

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