A chain condition is a property, typically involving considerations
of cardinality, of the family of open subsets of a topological
space. (Sample questions: (a) How large a fmily of pairwise
disjoint open sets does the space admit? (b) From an uncountable
family of open sets, can one always extract an uncountable
subfamily with the finite intersection property. This monograph,
which is partly fresh research and partly expository (in the sense
that the authors co-ordinate and unify disparate results obtained
in several different countries over a period of several decades) is
devoted to the systematic use of infinitary combinatorial methods
in topology to obtain results concerning chain conditions. The
combinatorial tools developed by P. Erdos and the Hungarian school,
by Erdos and Rado in the 1960s and by the Soviet mathematician
Shanin in the 1940s, are adequate to handle many natural questions
concerning chain conditions in product spaces.
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