New posts in Extremal Combinatorics

Counting the number of maximal chains in a poset

Maximum area of triangle inside a convex polygon

Determine the largest natural number $r$ with the property that among any five subsets with $500$ elements of the set $\{1,2,\ldots,1000\}$

Maximum number of right-angled triangles

Maximum distance between points in a triangle

Largest-area shape with diameter 1?

How many acute triangles can be formed by 100 points in a plane?

An extremal combinatorics problem

Positive integer combination of non-negative integer vectors

Set family $\mathcal{F}$ such that for all $A,B,C \in \mathcal{F}$ both $A \cap B \not \subseteq C$ and $C \not \subseteq A \cup B $