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Top posts (959) All Questions Answers | Votes Newest

68 Prove $|e^{i\theta} -1| \leq |\theta|$ Nov 28 '13
44 Nice examples of groups which are not obviously groups Apr 15 '13
41 How to prove every closed interval in R is compact? Apr 21 '13
31 Can the matrices $A$ and $I+A$ have the same determinant? Feb 13 '13
28 Change of basis matrix to convert standard basis to another basis Mar 25 '13
28 For what $n$ is $U_n$ cyclic? Feb 26 '13
28 Is the inverse of a symmetric matrix also symmetric? Mar 8 '13
25 If $d(x,y)$ is a metric, then $\frac{d(x,y)}{1 + d(x,y)}$ is also a metric Feb 20 '13
23 How to prove $\det(e^A) = e^{\operatorname{tr}(A)}$? Mar 6 '13
21 The series $\sum\limits_{n=1}^\infty \frac n{\frac1{a_1}+\frac1{a_2}+\dotsb+\frac1{a_n}}$ is convergent Dec 10 '13
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