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25 Are Singleton sets in $\mathbb{R}$ both closed and open? Jan 16 '11
17 How to prove closure of $\mathbb{Q}$ is $\mathbb{R}$ Jan 26 '11
14 Arbitrary intersection of closed sets is closed Jan 26 '11
9 If $Ax = Bx$ for all $x \in C^{n}$, then $A = B$. May 29 '11
8 Continuity of a function at an isolated point Dec 27 '10
6 How $m^4+4 = 0 \Rightarrow m = 1 \pm i,-1\pm i$? Feb 20 '11
6 How to study for analysis? Aug 22 '13
5 Proving derived sets are closed Jun 9 '13
5 Can a generalized eigenvectors be generated by a scalar which is not an eigenvalue? Jan 14 '13
5 How to prove $|f(x) - f(y)| < |x - y|$ if $f(x) = x + 1/x$ where $x > 1$ Feb 4 '11
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