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$$ \text{Let }f(x)=x ,x\in \mathbb{Q}\\ \text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ } \text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }=2-x , x \in \mathbb{R}-\mathbb{Q}$$ show that (i) $\lim_{x\to1}f(x) =1$ , (ii)$\lim_{x\to c}f(x) \text {does not exist, if }c\neq 1$

Sankha
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    You can use \quad or \ \ for white-spacing. But, actually, \begin{align} \end{align} is what you wanted. – VIVID Dec 17 '20 at 10:26

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