Characterization of apartments in polar Grassmannians

Details Characterization of apartments in polar Grassmannians Characterization of apartments in polar Grassmannians

2011-09-12

arxiv.org/abs/1109.2555v1

Mathematics

Combinatorics

Scientific paper

Buildings of types $\textsf{C}_n$ and $\textsf{D}_n$ are defined by rank $n$ polar spaces. The associated building Grassmannians are polar and half-spin Grassmannians. Apartments in dual polar spaces and half-spin Grassmannians were characterized in \cite{CKS}. We characterize apartments in all polar Grassmannians consisting of non-maximal singular subspaces. This characterization is a partial case of more general results concerning embeddings of polar Johnson graphs in polar Grassmann graphs.

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