The Urysohn number of a space X is U (X) = min{tau : for every subset A of X such that the cardinality of A is greater or equal to tau one can pick neighborhoods U-a of a for all a so that the intersection of the clousures of these elements is empty}. Some known statements about Urysohn spaces can be generalized in terms of the Urysohn number.
On the Urysohn Number of A Topological Space
BONANZINGA, Maddalena;CAMMAROTO, Filippo;
2011-01-01
Abstract
The Urysohn number of a space X is U (X) = min{tau : for every subset A of X such that the cardinality of A is greater or equal to tau one can pick neighborhoods U-a of a for all a so that the intersection of the clousures of these elements is empty}. Some known statements about Urysohn spaces can be generalized in terms of the Urysohn number.File in questo prodotto:
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