Top network posts
- 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
- 7 Mean square density loss when removing the exceptional set of a graph equipartition
- 7 The only surface with at least three distinct lines through each of its points is the plane
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