Emolga

### Questions (95)

 41 Is there a matrix of every size with all its submatrices invertible? 11 Does every number not ending with zero have a multiple without zero digits at all? 10 The angle $168^\circ$ is constructible 9 Covering a set $A \subset \Bbb R$ by two families of disjoint intervals taken from given intervals 8 Determinant of symmetric matrix is an irreducible polynomial

### Reputation (1,370)

 +5 The only surface with at least three distinct lines through each of its points is the plane +5 Is there a matrix of every size with all its submatrices invertible? +5 The angle $168^\circ$ is constructible +5 Mean square density loss when removing the exceptional set of a graph equipartition

### Answers (23)

 7 Show that if $E\subset\mathbb{R}$ is a measurable set, so $f:E\rightarrow \mathbb{R}$ is a measurable function. 6 $n + (n+1)^2 + (n+2)^3$ is a multiple of $16$ where $n$ is odd number 2 Showing Green's function on a Riemann surface can be pulled back 2 Insightful alternative proof that the average of sample variances of a set equals its overall sample variance (definition inside) 2 dense sets and which of the following are true??

### Tags (114)

 12 real-analysis × 8 2 complex-analysis × 17 9 analysis × 14 2 combinatorics × 13 7 measure-theory × 4 2 probability × 9 7 lebesgue-measure 2 statistics × 3 6 elementary-number-theory × 3 2 riemann-surfaces × 3

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