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2d
accepted Prove that the sequenze $b_n=\left(1+\frac{1}{n}\right)^{n+1}$ is decreasing
2d
asked Prove that the sequenze $b_n=\left(1+\frac{1}{n}\right)^{n+1}$ is decreasing
Oct
22
comment Study the series $\sum_{n=1}^{\infty} \left|\frac{1}{n^{\cos\theta+ i \sin \theta}}\right|$
Why? The series is divergent?
Oct
22
asked Study the series $\sum_{n=1}^{\infty} \left|\frac{1}{n^{\cos\theta+ i \sin \theta}}\right|$
Oct
22
comment Calculate $\Bigl|\frac{1}{n^z}\Bigr|$.
Thank you very much !!
Oct
21
comment Calculate $\Bigl|\frac{1}{n^z}\Bigr|$.
Sorry, butnI don't understand
Oct
21
asked Calculate $\Bigl|\frac{1}{n^z}\Bigr|$.
Oct
21
comment Convergence of $\sum_{n=1}^{\infty} \frac{1}{n^z}$
I try a condition on modulus...
Oct
21
comment Convergence of $\sum_{n=1}^{\infty} \frac{1}{n^z}$
Is $|z|\geq 1$?
Oct
21
asked Convergence of $\sum_{n=1}^{\infty} \frac{1}{n^z}$
Oct
15
accepted Convert a complex number into trigonometric form.
Oct
15
comment Convert a complex number into trigonometric form.
yes...but without results.
Oct
15
asked Convert a complex number into trigonometric form.
Oct
14
awarded  Popular Question
Oct
7
accepted Calculate $\int_{-\pi}^{\pi}\frac{1-\cos \frac{t}{4}}{5-2\cos t}dt$
Oct
6
asked Calculate $\int_{-\pi}^{\pi}\frac{1-\cos \frac{t}{4}}{5-2\cos t}dt$
Oct
5
asked Calculate $\sum_{n=0}^\infty 2^{-n} e^{i n t}$
Sep
29
accepted Prove that $\bar z_1 z_2+z_1 \bar z_2=2\Re(\bar z_1 z_2)$
Sep
29
asked Prove that $\bar z_1 z_2+z_1 \bar z_2=2\Re(\bar z_1 z_2)$
Sep
29
asked Entire function $f(z)=\int_a^b \operatorname{sinc}(z-t) d\omega(t)$.