Saturday 16 July 2016

calculus - Find $lim_{xrightarrow0}frac{x}{[x]}$



Find $\lim_{x\rightarrow0}\frac{x}{[x]}$



$[x]$ represent greatest integer less than or equal to x.



Right hand limit is not defined as [0+]=0, left hand limit is zero as [0-]=-1.
I want to know whether we can say limit exist or not. Because Left Hand Limit $\ne$Right Hand Limit


Answer




For $x\to 0$ the expression $\frac{x}{[x]}$ is not well defined since for $0

As you noticed, we can only consider



$$\lim_{x\rightarrow0^-}\frac{x}{[x]}=0$$


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