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4.1: Інтервали
https://ukrayinska.libretexts.org/%D0%9C%D0%B0%D1%82%D0%B5%D0%BC%D0%B0%D1%82%D0%B8%D0%BA%D0%B0/%D0%90%D0%BD%D0%B0%D0%BB%D1%96%D0%B7/%D0%9A%D0%BD%D0%B8%D0%B3%D0%B0%3A_%D0%91%D1%83%D0%BA%D0%B2%D0%B0%D1%80_%D1%80%D0%B5%D0%B0%D0%BB%D1%8C%D0%BD%D0%BE%D0%B3%D0%BE_%D0%B0%D0%BD%D0%B0%D0%BB%D1%96%D0%B7%D1%83_(Sloughter)/04%3A_%D0%A2%D0%BE%D0%BF%D0%BE%D0%BB%D0%BE%D0%B3%D1%96%D1%8F_%D1%80%D0%B5%D0%B0%D0%BB%D1%8C%D0%BD%D0%BE%D1%97_%D0%BB%D1%96%D0%BD%D1%96%D1%97/4.01%3A_%D0%86%D0%BD%D1%82%D0%B5%D1%80%D0%B2%D0%B0%D0%BB%D0%B8
$(a, b)=\{x: x \in \mathbb{R}, a<x<b\}$ $[a, b]=\{x: x \in \mathbb{R}, a \leq x \leq b\},$ $(-\infty, b]=\{x: x \in \mathbb{R}, x \leq b\},$ $[a,+\infty)=\{x: x \in \mathbb{R}, x \geq a\}$ \[(... $(a, b)=\{x: x \in \mathbb{R}, a<x<b\}$ $[a, b]=\{x: x \in \mathbb{R}, a \leq x \leq b\},$ $(-\infty, b]=\{x: x \in \mathbb{R}, x \leq b\},$ $[a,+\infty)=\{x: x \in \mathbb{R}, x \geq a\}$ $(a, b]=\{x: x \in \mathbb{R}, a<x \leq b\}$ $[a, b)=\{x: x \in \mathbb{R}, a \leq x<b\},$ $(a, b)=\{x: x=\lambda a+(1-\lambda) b, 0<\lambda<1\}.$ $x=\left(\frac{b-x}{b-a}\right) a+\left(\frac{x-a}{b-a}\right) b=\left(\frac{b-x}{b-a}\right) a+\left(1-\frac{b-x}{b-a}\right) b$