Neighborhood of $x$ (近傍) (in $\mathbb{R}$)
QUESTION
Neighborhood of $x$ (近傍) (in $\mathbb{R}$)
Click to reveal answer ANSWER
A subset $V \subset \mathbb{R}$ such that there exists a strict interval $]a, b[$ with $a < x < b$ and $]a, b[ \subset V$. The family of all neighborhoods of $x$ is denoted by $\mathcal{N}(x)$.
Click to see question - ソースノート: chapter2.md
- カードID: neighborhood-of-x
- 状態: active