Question Number 205794 by mnjuly1970 last updated on 30/Mar/24
$$ \\ $$$$ \\ $$$$\:\:\:\:\:\:\:\mathrm{A}\:=\:\left\{\:\frac{{k}}{\mathrm{2}^{{n}} }\:\mid\:\mathrm{1}\leqslant\:{k}\:\leqslant\:\mathrm{2}^{{n}} \:,\:{n}\in\mathbb{N}\:\right\} \\ $$$$\:\:\:\:\:{find}\:.\:\:\overset{\:−} {\mathrm{A}}\:=\:? \\ $$$$ \\ $$
Commented by A5T last updated on 30/Mar/24
$${A}=\left(\mathrm{0},\mathrm{1}\right]?\:\:\:\Rightarrow\overset{−} {{A}}=\mathbb{R}\backslash\left(\mathrm{0},\mathrm{1}\right] \\ $$$$\left({if}\:\overset{−} {{A}}\:{means}\:{complement}\:{of}\:{A}\right) \\ $$
Answered by TheHoneyCat last updated on 30/Mar/24