Alex Ravsky
• Lviv, Ukraine
• Member for 8 years, 5 months

 90 How to prove every closed interval in R is compact? 27 Graph theoretic proof: For six irrational numbers, there are three among them such that the sum of any two of them is irrational. 23 Graph theoretic proof: For six irrational numbers, there are three among them such that the sum of any two of them is irrational. 20 Do Hausdorff spaces that aren't completely regular appear in practice? 19 Integer function which takes every value infinitely often

### Reputation (77,014)

 +10 Closure of c$_0$ in Uniform Topology +10 Is there such thing as an unnormed vector space? +10 Show that the number of connected components are less or equal of the degree of vertex in a cut set. +10 igraph - Minimum vertex set origin for destination

### Questions (20)

 17 Is a finite group determined by the family of all its 2-generated subgroups? 15 Asymptotics of the sum of squares of binomial coefficients 11 The fair soup division and approximating numbers 11 Asymptotics of the lower approximation of a pair of natural numbers by a coprime pair 11 Is a polynomial $y^n+y^{n-1}-x^m-x^{m-1}$ irreducible in $\Bbb Z[x,y]$?

### Tags (558)

 992 general-topology × 554 239 combinatorics × 158 434 graph-theory × 307 207 topological-groups × 104 357 real-analysis × 212 201 metric-spaces × 138 350 compactness × 127 161 geometry × 85 245 inequality × 184 143 linear-algebra × 116

### Bookmarks (204)

 108 What is the smallest number of $45^\circ-60^\circ-75^\circ$ triangles that a square can be divided into? 49 Cutting up a circle to make a square 39 A stronger version of discrete "Liouville's theorem" 39 Prove this inequality with $xyz\le 1$ 36 Expected outcome for repeated dice rolls with dice fixing