query: If $f$ is integrable, how to show that $\sum_{n=1}^\infty 2^n\lambda(\{\lvert f\rvert\ge 2^n\})<\infty$
positive_passages.docid: 19858
positive_passages.text: Proving $f$ is $L^1$ implies convergence of $\sum_{k \in \mathbb{Z}}{ 2^k*m(|f| > 2^k)}$
negative_passages.docid: 73696
negative_passages.text: Given $(a_n)$ with $a_n \geq a_{n+1} \geq 0$ show that if $\sum \sqrt{a_n a_{n+1}} < \infty \implies \sum a_n < \infty$
negative_passages.docid: 63612
negative_passages.text: Determine convergence of $\sum_{n=1}^{\infty}a_n$
negative_passages.docid: 16143
negative_passages.text: How can I prove that $\sum_{n=1}^\infty \frac{1}{n(n+1)} = 1$?
negative_passages.docid: 16555
negative_passages.text: If $\mathbb f$ is analytic and bounded on the unit disc with zeros $a_n$ then $\sum_{n=1}^\infty \left(1-\lvert a_n\rvert\right) \lt \infty$
negative_passages.docid: 6990
negative_passages.text: For $f$ Riemann integrable prove $\lim_{n\to\infty} \int_0^1x^nf(x)dx=0.$
negative_passages.docid: 101286
negative_passages.text: How show that $|a_{n}-1|\le c\lambda ^n,\lambda\in (0,1)$
negative_passages.docid: 98282
negative_passages.text: Prove that the function $\xi\in R \mapsto {e^{i\cdot \xi\cdot λ}-1\over i\cdot \xi}-λ$ is $C^{\infty}$
negative_passages.docid: 44261
negative_passages.text: Convergence of $\sum^\infty_{n=1} \ln(1+\frac 1 {2^n})$
negative_passages.docid: 16775
negative_passages.text: Showing that $\int_{0}^{\infty} \frac{dx}{1 + x^2} = 2 \int_0^1 \frac{dx}{1 + x^2}$
negative_passages.docid: 16776
negative_passages.text: How to prove $\sum_{m=1}^\infty \sum_{n=1}^\infty \frac{1}{m^2+n^2}=+\infty$
negative_passages.docid: 58647
negative_passages.text: Show that $f$ is integrable and $\int_{I} f=0$
negative_passages.docid: 10675
negative_passages.text: Proving that $\frac{1}{2\pi}\int_{0}^{2\pi}|f(re^{it})|^2dt=\sum_{n=0}^{\infty}|a_n|^2r^{2n}$
negative_passages.docid: 66504
negative_passages.text: Proof that $f$ is Lebesgue-integrable and calculate its integral
negative_passages.docid: 30407
negative_passages.text: Prove that $\sum_{n=1}^\infty\frac{n}{n^2+1}$ is divergent
negative_passages.docid: 140614
negative_passages.text: Show that $\sum^\infty_{n=m}\frac{1}{n^2} = O(\frac{1}{m})$
negative_passages.docid: 3735
negative_passages.text: If $\sum_{1}^{\infty}(a_n)^3$ diverges, does $\sum_{1}^{\infty}(a_n)$?