Absolutely universal projective embeddings of long-root geometries of orthogonal type

Antonio Pasini

Let $G$ be a split Chevalley group of type $B_n$ ($n\ge 3$) or $D_n$ ($n\ge 4$), let $L$ be its Lie algebra and $\Gamma$ its long-root geometry, namely $\Gamma$ is the line-grassmannian…