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countably many

   Also found in: Wikipedia 0.01 sec.
countably many - countable


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In some sense, it does not: A typical equivalence class for [approximately equal to] is a singleton, and non-trivial equivalent classes can contain at most three points (there are only countably many classes containing three points).
Then X is automatically pairwise Lindelof in this topology, since every open set only omits countably many points of X.
k](f) when k tends to infinity (in this approach f is treated as a boolean function of countably many variables, even though it depends only on the finite number of them).
 
 
 
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