### Questions (253)

 49 How to start a math blog? 16 Is every sigma-algebra generated by some random variable? 15 Additivity of the matrix exponential of infinite matrices 15 A planar Brownian motion has area zero 12 Book on Measure Theoretic Statistics

### Reputation (9,893)

 +10 A necessary and sufficient condition for a symmetric matrix to be positive semidefinite in terms of its Schur complement +10 Show that for every $\epsilon>0$ there exists a dense open subset $V$ of $\mathbb{R}$ such $m(V) = \epsilon$. +10 Product rule for Hessian matrix +10 Linear regression with the addition of a Euclidean norm penalty

 20 Double absolute value proof: $||a|-|b||\le |a-b|$ 13 Proving the reflection principle of Brownian motion 12 A planar Brownian motion has area zero 10 Conditional probability on zero probability events (Definition) 10 Existence of conditional density given conditional distribution

### Tags (189)

 75 probability-theory × 123 27 real-analysis × 48 53 measure-theory × 79 21 reference-request × 29 37 stochastic-processes × 60 20 absolute-value 32 probability × 29 17 brownian-motion × 20 28 inequality × 12 16 convergence-divergence × 15

### Bookmarks (24)

 126 Learning Lambda Calculus 91 GRE Subject Test - Past Papers, Books, Advice 25 Type theory as foundations 10 A Borel set whose projection onto the first coordinate is not a Borel set 10 Types, Sets and Categories