Cocountable Filter at $B$ (余可算フィルター) (Example II.2.24)
QUESTION
Cocountable Filter at $B$ (余可算フィルター) (Example II.2.24)
Click to reveal answer ANSWER
For $B \subset X$, the family $(B)_1$ of all $B$-cocountable sets (sets $F$ such that $B \setminus F$ is countable or empty).
Click to see question - ソースノート: chapter2.md
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