User user102822 - MathOverflow

user102822

Member for 6 years, 11 months
Last seen more than 5 years ago

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Teacher

Dec 24, 2016

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47

Why study finite-dimensional vector spaces in the abstract if they are all isomorphic to $R^n$?

13

How can I show that a bijection between $[0,1)$ and $(0,1)$ cannot be continuous?

11

Collection of surprising identities and equations.

11

If $a_n+b_n\sqrt{3}=(2+\sqrt{3})^n$, then what's $\lim_{n\rightarrow\infty}\frac{a_n}{b_n}$?

9

Show that:$\prod_{n=1}^{\infty}\left({2n\over 2n-1}\right)^2\left(\cdots\right)={\pi\over2}\cdot{\phi\over5}\cdot\sqrt{\phi\sqrt{5}}$