Restriction of a Filter (フィルターの制限)
QUESTION
Restriction of a Filter (フィルターの制限)
Click to reveal answer ANSWER
The filter $\mathcal{F} \vee A := \mathcal{F} \vee \{A\}^\uparrow$.
Click to see question - ソースノート: chapter2.md
- カードID: restriction-of-a-filter
- 状態: active