Описание:Spherical homogeneous spaces are a beautiful class of homogeneous spaces of reductive algebraic groups which include almost all classical examples such as: projective spaces, quadrics, Grassmannians, flag varieties, symmetric spaces, and more. An important feature of spherical homogeneous spaces is that they arise in different areas and are remarkable from different viewpoints including equivariant algebraic geometry, representation theory and harmonic analysis, symplectic geometry and integrable systems, Schubert calculus and enumerative geometry, etc.
This lecture course introduces spherical homogeneous spaces from various viewpoints, with basic examples. Several algebraic and representation-theoretic applications of spherical homogeneous spaces are discussed. An introduction to spherical homogeneous spaces over real numbers, especially on classification of real orbits in their real loci, is given.