| k-Sets, Convex Quadrilaterals, and the Rectilinear Crossing Number of Kn Recent countries visiting this post |  |
 | 6 | United States |
 | 1 | Sweden |
 | 1 | Russian Federation |
| k-Sets, Convex Quadrilaterals, and the Rectilinear Crossing Number of Kn Recent countries visiting this post | |
| 6 | United States |
| 1 | Sweden |
| 1 | Russian Federation |