New posts in Extremal Combinatorics

Find smallest $n$ fulfilling requirement

Minimizing the sum of the six distances determined by four points in the plane, if each distance is at least $d$

black and white grid

Lower bound for $\sum_{v \in V(G)} d(v)\bar{d}(v)$

How many vertices can a hypercube-hyperplane intersection have?

An invisible ghost jumping on a regular hexagon

Best way to fill a $8\times 8$ board

Partitions that separate all subsets

Partitions that separate all triples

Number of Derangements of the word BOTTLE