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- 68 Prove $|e^{i\theta} -1| \leq |\theta|$
- 48 Nice examples of groups which are not obviously groups
- 44 How to prove every closed interval in R is compact?
- 42 Change of basis matrix to convert standard basis to another basis
- 34 If $d(x,y)$ is a metric, then $\frac{d(x,y)}{1 + d(x,y)}$ is also a metric
- 32 Can the matrices $A$ and $I+A$ have the same determinant?
- 30 For what $n$ is $U_n$ cyclic?
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