Wednesday, 23 November 2016

real analysis - Show $1-1/x


Show $1-1/x <\ln(x) for all x>1?





My attempt:



(1) $\ln (x)



Suppose h:R+R,tt1ln(t), then h(t)=0 if t=1. Furthermore h(t)>0 for all tR+.



(2) 11/x<ln(x)



Suppose f:R+R,tln(t)1+1t, then f(t)=0 for t=1 and f(t)>0 for all tR+.




Therefore the inequality is true.

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