Ben Derrett
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 9 What is a rigorous way to prove that this graph is non-planar? 8 Find all integers $k>2$ such that $5\equiv k \bmod k^2$ 7 If $f:\mathbb{R}\to\mathbb{R}$ is a left continuous function can the set of discontinuous points of $f$ have positive Lebesgue measure? 7 Trigonometric equality: $\frac{1 + \sin A - \cos A}{1 + \sin A + \cos A} = \tan \frac{A}{2}$ 6 An inequality about binomial distribution

### Reputation (2,027)

 +15 Distribution of hitting time of line by Brownian motion +15 Gaussian, measurability +120 Decomposing $Y=U_1+U_2$ so that $\operatorname{Cov}(U_1,X\mid Z)=0$ and $\operatorname{Cov}(U_2,X\mid Z)=\operatorname{Cov}(U_2,X)$ +10 When are stable continuous time Markov chains Feller? Always?

### Questions (37)

 20 If $f:\mathbb{R}\to\mathbb{R}$ is a left continuous function can the set of discontinuous points of $f$ have positive Lebesgue measure? 17 If every open set is a countable union of balls, is the space separable? 12 How to calculate the matrix exponential explicitly for a matrix which isn't diagonalizable? 9 Distribution of hitting time of line by Brownian motion 9 Considering Brownian bridge as conditioned Brownian motion

### Tags (42)

 25 stochastic-processes × 38 9 real-analysis × 6 25 probability × 13 9 planar-graph 18 measure-theory × 13 8 integration × 4 17 probability-theory × 22 8 elementary-number-theory 10 graph-theory × 3 7 brownian-motion × 5

### Accounts (22)

 Mathematics 2,027 rep 1032 Computer Science 215 rep 16 MathOverflow 166 rep 6 TeX - LaTeX 152 rep 5 Area 51 151 rep 1