Calculus 10th Edition

Published by Brooks Cole
ISBN 10: 1-28505-709-0
ISBN 13: 978-1-28505-709-5

Chapter 1 - Limits and Their Properties - 1.4 Exercises: 59


The function has a discontinuity at each integer value of $x.$

Work Step by Step

To prove let $n$ be any integer and let $z=n-8$: $\lim\limits_{x\to n^-}f(x)=[[n^--8]]=z^-\to (z-1)\lt z^-\leq z\to$ $\lim\limits_{x\to n^-}f(x)=z-1.$ $\lim\limits_{x\to n^+}f(x)=[[n^+-8]]=z^+\to z\lt z^+\leq (z+1)\to$ $\lim\limits_{x\to n^+}f(x)=z.$ Since $\lim\limits_{x\to n^-}f(x)\ne\lim\limits_{x\to n^+}f(x)\to\lim\limits_{x\to n}f(x)$ does not exist and hence the function is not continuous at $n.$ These are non-removable discontinuities.
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