Grassmannian Realizations of Classical Pseudo-Riemannian Symmetric Spaces

We establish a unified fixed-point Grassmannian framework for the classical pseudo-Riemannian symmetric spaces from Berger's classification. For a classical group G=Aut(V,b), we identify G with the open graph-like locus inside an ordinary or maximal-isotropic Grassmannian Ḡ. Natural involutions of Ḡ are constructed via classical forms, compatible scalar structures, and subspace configurations. We explicitly describe the full fixed loci of these involutions in terms of classical Grassmannians. The corresponding graph-like fixed loci (or their signature strata) are identified, respectively, with the moduli spaces of classical forms, compatible scalar structures, and subspace configurations; these moduli spaces coincide with classical pseudo-Riemannian symmetric spaces. In summary, the 54 classical series are organized into four families: 10 group-type models, 7 classical-form Grassmannians, 20 scalar-structure Grassmannians, and 17 subspace-configuration Grassmannians.