Proper Filter (固有フィルター)
QUESTION
Proper Filter (固有フィルター)
Click to reveal answer ANSWER
A filter $\mathcal{F}$ is proper if $\emptyset \notin \mathcal{F}$. If $\emptyset \in \mathcal{F}$, the filter is **improper** (which is the power set $2^X$). Proper, non-empty filters are called **non-degenerate**.
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