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LE Anh Dung

I'm trying to teach myself Abstract Algebra, Topology, and Analysis.

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18 Prove that $\lim_{n \rightarrow \infty} \sum_{k=0}^{n} \frac{1}{k!} = e$ Aug 9 '19
13 Julius König's proof of Schröder–Bernstein theorem Apr 23 '18
8 10 equivalent definitions of normal subgroup Jul 7 '20
8 How to utilize the special feature of this recursive problem to reduce computational complexity? May 29 '20
8 How to approximate $49^{4}81^{5}$? Mar 16 '19
7 The importance and applications of order of a group? Jul 23 '20
7 What is $(X_{m}^{n, x})_{n \leq m \leq N}$ in lecture note Optimal Stopping and American Options by Damien Lamberton? Apr 19 '20
7 Multiplying inequalities. Jul 15 '18
6 The $|\cdot|_{p}$ norm will become the maximum norm when $p \to \infty$ Aug 7 '19
6 Is it true that every closed set is a countable intersection of open intervals? Feb 20 '19
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