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Julien

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Top posts (959) All Questions Answers | Votes Newest

66 Prove $|e^{i\theta} -1| \leq |\theta|$ Nov 28 '13
43 Nice examples of groups which are not obviously groups Apr 15 '13
38 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
27 For what $n$ is $U_n$ cyclic? Feb 26 '13
27 Change of basis matrix to convert standard basis to another basis Mar 25 '13
26 Is the inverse of a symmetric matrix also symmetric? Mar 8 '13
24 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
20 Let $A$ and $B$ be $n \times n$ real matrices such that $AB=BA=0$ and $A+B$ is invertible Mar 26 '13
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