Proposition: Limit of Logarithmic Growth as Compared to Positive Power Growth

For all (fixed) positive real numbers $\alpha > 0$, we have that $$\lim_{x\to\infty}\frac {\ln(x)}{x^\alpha}=0,$$ $$\lim_{x\to\infty}\frac {x^\alpha}{\ln (x)}=\infty,$$ $$\lim_{x\searrow 0}{x^\alpha}{\ln (x)}=0.$$

These limits show that if $x$ is growing, the growth of the logarithmic function of $x$ is slower than the growth of $x$ to the power of $\alpha$, no matter small $\alpha$ is.

Proofs: 1


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References

Bibliography

  1. Forster Otto: "Analysis 1, Differential- und Integralrechnung einer Veränderlichen", Vieweg Studium, 1983