Inner Ideals and Intrinsic Subspaces of Linear Pair Geometries

2006/06/19 by Wolfgang Bertram, Bertram, Wolfgang, Harald Loewe +1 · 1 citation
Engineering · Mathematics · #17C27 #17C37 #51B05 #51N30 #Advanced Numerical Analysis Techniques #FOS: Mathematics #Mathematics and Applications #Rings and Algebras (math.RA)

paper · pdf · doi:10.48550/arxiv.math/0606448

openalex publication_date 2006/06/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We introduce the notion of intrinsic subspaces of linear and affine pair geometries, which generalizes the one of projective subspaces of projective spaces. We prove that, when the affine pair geometry is the projective geometry of a Lie algebra introduced in [Bertram-Neeb, J. Alg. 277], such intrinsic subspaces correspond to inner ideals in the associated Jordan pair, and we investigate the case of intrinsic subspaces defined by the Peirce-decomposition which is related to 5-gradings of the projective Lie algebra. These examples, as well as the examples of general and Lagrangian flag geometries, lead to the conjecture that geometries of intrinsic subspaces tend to be themselves linear pair geometries.

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