Filter of Cofinite Preimages ($\Gamma_\varphi$)
QUESTION
Filter of Cofinite Preimages ($\Gamma_\varphi$)
Click to reveal answer ANSWER
For a sequence $\varphi \in X^N$ on an infinite countable set $N$, the family of subsets of $X$ defined by:
$$E \in \Gamma_\varphi \iff \varphi^{-1}(E) \text{ is cofinite in } N$$
Click to see question - ソースノート: chapter2.md
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