2 problems

Let $(\mathbb{R}P^1)^3$ be the product of three real projective lines with the standard real structure, and let $\mathfrak{s}_{(\mathbb{R}P^1)^3}$ be the $Spin_3$-structure over…

Effective anticanonical divisor conjecture. There is an effective $\mathbb{Q}$-divisor $D$ on $X$ such that