AI 中文总结
本文确定了单群旗流形 $G/P$ 的有理同伦群与有理上同调环,通过 $G$ 与 $P$ 的有理同伦类型及基本 Weyl 不变量的限制来刻画。
AI 中文摘要
设 $G/P$ 为旗流形,其中 $G$ 为单群。我们确定有理同伦群 $\pi_{\ast}(G/P)\otimes \mathbb{Q}$,并描述有理上同调环 $H^{\ast}(G/P;\mathbb{Q})$,其表述基于 $G$ 和 $P$ 的有理同伦类型 $\mathcal{F}_{G}$ 和 $\mathcal{F}_{P}$。证明基于 $G$ 的基本 Weyl 不变量在 $P$ 的适当单因子上的限制。
英文摘要
Let $G/P$ be a flag manifold with $G$ simple. We determine the rational homotopy groups $π_{\ast }(G/P)\otimes \mathbb{Q}$ and describe the rational cohomology ring $H^{\ast }(G/P;\mathbb{Q})$ solely in terms of the rational homotopy types of $G$ and $P$, respectively. The proof is based on the restrictions of basic Weyl invariants of $G$ to suitable simple factors of $P$, which also address a key nonvanishing issue not settled by earlier approaches of Meier, Shiga-Tezuka, Kotschick, and Terzic.
Comments14 pages