A Lie group is called $p$-regular if it has the $p$-local homotopy type of a product of spheres. (Non)triviality of the Samelson products of the inclusions of the factor spheres into $p$-regular $\mathrm{ SO}(2n)_{ (p)}$ is determined, which completes the list of (non)triviality of such Samelson products in $p$-regular simple Lie groups. As an application, we determine the homotopy normality of the inclusion $\mathrm{ SO}(2n-1)\to\mathrm{ SO}(2n)$ in the sense of James at any prime $p$.
Categories: math.AT