New posts in Extremal Combinatorics

How few $k$-dimensional subspaces of $V$ are enough to have a complement to each $n-k$-dimensional subspace?

Random sequence of integers in $\{1, 2, \dots, n \}$ which is "everywhere probably increasing" - how long can it be?

Cauchy-Schwarz proof of Sidorenko for 3-edge path (Blakley-Roy inequality)