2 problems

Let $X$ be a projective variety of dimension $n$, let $\pi:X\to Z$ be a surjective morphism of projective varieties of relative dimension $e$, and let…

Let $X$ be a projective variety over $\mathbb{C}$, let $N_k(X)_{\mathbb{Z}}$ denote the group of $k$-cycle classes up to numerical equivalence, and let…