Frankel's conjecture for compact Kähler manifolds

Let $(M,\omega)$ be a compact $n$-dimensional Kähler manifold with positive holomorphic bisectional curvature. Frankel's conjecture. Then $M$ is biholomorphic to $\mathbb{CP}^{n}$. Frankel's conjecture was resolved independently by Siu–Yau via differential geometry and by Mori via algebraic geometry; the more general Hartshorne conjecture was also proved.