Top network posts

• 7 Are the limits $\lim\limits_{n\to \infty }\left|\frac{a_{n+1}}{a_n}\right|\,$ and $\lim\limits_{n\to \infty }\sqrt[n]{|a_n|}\,$ equal?
• 6 Prove that the graph of a measurable function is measurable.
• 6 If $E$ is an infinite vector space, how to interprete $\sum_{i}x_ie_i$?
• 5 Bianchi identity proof : why we can consider $[X,Y]=[Y,Z]=[X,Z]=0$?
• 5 Why do we use $\left<\varphi,x\right>$ for $\varphi(x)$ when $\varphi$ is a linear functional?
• 5 Why $A$ invertible $\iff \det A\neq 0$
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