72 Is it possible to construct a sequence that ends in 1000000000? 23 How do I prove that a matrix is a rotation-matrix? 22 Shouldn't this function be discontinuous everywhere? 14 calculation $f(x)$ from given expression 13 If $x$ and $y$ are irrational but $x + y$ is rational then $x - y$ is irrational

### Reputation (6,910)

 +10 Proving generalized form of Laplace expansion along a row - determinant +10 If $\tan\theta$, $2\tan\theta+2$, $3\tan\theta +3$ are in geometric progression then find … +10 Is it possible to construct a sequence that ends in 1000000000? +10 Derivative of the $l_p$ norm

### Questions (5)

 11 A technical relation 4 Proximal mapping of $f(U) = -\log \det(U)$ 3 Possible values of $\lim_{x \rightarrow \infty} \left(\frac{p(x)}{q(x)}\right)^x$ 3 Best approximation for a normed vector space $X$ 1 Solving a matrix equation using numerical optimization

### Tags (113)

 133 linear-algebra × 79 27 algebra-precalculus × 10 72 problem-solving 26 functions × 7 47 real-analysis × 26 25 limits × 5 45 matrices × 34 24 continuity × 2 38 calculus × 26 23 notation × 6