mrk

### Questions (72)

 23 Intersection of topologies 15 Intuitive understanding of manifolds 12 Resources for self-study of general topology 10 Prove Intersection of $\sigma$-algebras is a $\sigma$-algebra and the powerset is a $\sigma$-algebra 9 Number of equivalence relations on a finite set

### Reputation (2,717)

 +10 Prove Intersection of $\sigma$-algebras is a $\sigma$-algebra and the powerset is a $\sigma$-algebra +10 Intersection of topologies +10 Length of the voronoi diagram +10 Number of equivalence relations on a finite set

 10 Full rank vs short rank matrix 5 Finding limit points of subsets of the cofinite topology on $\mathbb{Z}$ 4 Initial segment topology 0 Topology - limit point of a sequence 0 Expansion of $x^4\over1+x^2$ into a power series

### Tags (72)

 10 matrices × 2 0 generating-functions × 5 9 general-topology × 19 0 group-theory × 5 0 measure-theory × 8 0 geometry × 4 0 proof-verification × 6 0 linear-algebra × 4 0 recurrence-relations × 5 0 polygons × 4

### Bookmarks (5)

 148 How to prove Euler's formula: $e^{i\varphi}=\cos(\varphi) +i\sin(\varphi)$? 102 What is the Jacobian matrix? 16 The Number of Topologies on a Finite Set 5 Number of even and odd subsets [duplicate] 1 Solve $X_n=\lfloor \sqrt{X_n} \rfloor+X_{n-1}$