Friday, October 14, 2016

calculus - Limit limxto1fraclogxx1 without L'Hôpital




I was wondering if it's possible to identify this limit without using L'Hôpital's Rule:

limx1logxx1


Answer



In THIS ANSWER and THIS ONE I showed, without the use of calculus, that the logarithm function satisfies the inequalities



x1xlog(x)x1



Therefore, we can write for x>1



1xlog(x)x11




and for x<1



1log(x)x11x



whereupon applying the squeeze theorem yields the result 1.


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