Mathematics
Julien
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I like maths.

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68 Prove $|e^{i\theta} -1| \leq |\theta|$ Nov 28 '13
50 Nice examples of groups which are not obviously groups Apr 15 '13
46 How to prove every closed interval in R is compact? Apr 21 '13
43 Change of basis matrix to convert standard basis to another basis Mar 25 '13
37 If $d(x,y)$ is a metric, then $\frac{d(x,y)}{1 + d(x,y)}$ is also a metric Feb 20 '13
34 For what $n$ is $U_n$ cyclic? Feb 26 '13
31 Can the matrices $A$ and $I+A$ have the same determinant? Feb 13 '13
29 How to prove $\det(e^A) = e^{\operatorname{tr}(A)}$? Mar 6 '13
29 Is the inverse of a symmetric matrix also symmetric? Mar 8 '13
26 Direct proof that nilpotent matrix has zero trace Dec 24 '13
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