In algebraic geometry, given a reductive algebraic group G and a Borel subgroup B, a spherical variety is a G-variety with an open dense B-orbit. It is sometimes also assumed to be normal. Examples are flag varieties, symmetric spaces and (affine or projective) toric varieties. There is also a notion of real spherical varieties. A projective spherical variety is a Mori dream space. Spherical embeddings are classified by so-called colored fans, a generalization of fans for toric varieties; this is known as Luna-Vust Theory. In his seminal paper, developed a framework to classify complex spherical subgroups of reductive groups; he reduced the classification of spherical subgroups to wonderful subgroups. He further worked out the case of groups of type A and conjectured that combinatorial objects consisting of "homogeneous spherical data" classify spherical subgroups. This is known as the Luna Conjecture.This classification is now complete according to Luna's program; see contributions of Bravi, Cupit-Foutou, Losev and Pezzini. As conjectured by Knop, every "smooth" affine spherical variety is uniquely determined by its weight monoid. This uniqueness result was proven by Losev. has been developing a program to classify spherical varieties in arbitrary characteristic. (Wikipedia).
What are the names of different types of polygons based on the number of sides
👉 Learn about polygons and how to classify them. A polygon is a plane shape bounded by a finite chain of straight lines. A polygon can be concave or convex and it can also be regular or irregular. A concave polygon is a polygon in which at least one of its interior angles is greater than 1
From playlist Classify Polygons
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👉 Learn about polygons and how to classify them. A polygon is a plane shape bounded by a finite chain of straight lines. A polygon can be concave or convex and it can also be regular or irregular. A concave polygon is a polygon in which at least one of its interior angles is greater than 1
From playlist Classify Polygons
Spherical Mirror and Thin Lenses UAEU
From playlist Optics
👉 Learn the essential definitions of triangles. A triangle is a polygon with three sides. Triangles are classified on the basis of their angles or on the basis of their side lengths. The classification of triangles on the bases of their angles are: acute, right and obtuse triangles. The cl
From playlist Types of Triangles and Their Properties
Calculus 3 Lecture 11.7: Using Cylindrical and Spherical Coordinates
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From playlist Calculus 3 (Full Length Videos)
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👉 Learn about polygons and how to classify them. A polygon is a plane shape bounded by a finite chain of straight lines. A polygon can be concave or convex and it can also be regular or irregular. A concave polygon is a polygon in which at least one of its interior angles is greater than 1
From playlist Classify Polygons
Talk by Jonathan Wang (MIT, USA)
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From playlist Seminars: Representation Theory and Number Theory
Raphaël Beuzart Plessis - 1/3 The Relative Langlands Program
Raphaël Beuzart Plessis (Univ. Aix-Marseille)
From playlist 2022 Summer School on the Langlands program
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Geordie Williamson: Langlands and Bezrukavnikov II Lecture 14
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From playlist Geordie Williamson: Langlands correspondence and Bezrukavnikov’s equivalence
Geordie Williamson: Langlands and Bezrukavnikov II Lecture 11
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From playlist Geordie Williamson: Langlands correspondence and Bezrukavnikov’s equivalence
Pierre Py - Complex geometry and higher finiteness properties of groups
Following C.T.C. Wall, we say that a group G is of type if it has a classifying space (a K(G,1)) whose n-skeleton is finite. When n=1 (resp. n=2) one recovers the condition of finite generation (resp. finite presentation). The study of examples of groups which are of type Fn-1 but not of
From playlist Geometry in non-positive curvature and Kähler groups
David Ben-Zvi: Boundary conditions and hamiltonian actions in geometric Langlands
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From playlist SMRI Algebra and Geometry Online
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Petra Schwer: Studying affine Deligne Lusztig varieties via folded galleries in buildings
Abstract: We present a new approach to affine Deligne Lusztig varieties which allows us to study the so called "non-basic" case in a type free manner. The central idea is to translate the question of non-emptiness and the computation of the dimensions of these varieties into geometric ques
From playlist Algebra
Action filtrations associated to smooth categorical compactifications - Laurent Côté
Joint IAS/Princeton/Montreal/Paris/Tel-Aviv Symplectic Geometry Topic: Action filtrations associated to smooth categorical compactifications Speaker: Laurent Côté Date: July 09, 2021 There is notion of a smooth categorical compactification of dg/A-infinity categories: for example, a smoo
From playlist Mathematics
Maxim Kontsevich - 3/4 Bridgeland Stability over Non-Archimedean Fields
Bridgeland stability structure/condition on a triangulated category is a vast generalization of the notion of an ample line bunlde (or polarization) in algebraic geometry. The origin of the notion lies in string theory, and is applicable to derived categories of coherent sheaves, quiver re
From playlist Maxim Kontsevitch - Bridgeland Stability over Non-Archimedean Fields
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Higgs bundles URL: http://www.icts.res.in/program/hb2016 DATES: Monday 21 Mar, 2016 - Friday 01 Apr, 2016 VENUE : Madhava Lecture Hall, ICTS Bangalore DESCRIPTION: Higgs bundles arise as solutions to noncompact analog of the Yang-Mills equation. Hitchin showed that irreducible solutio
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Introduction to Spherical Coordinates
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From playlist Calculus 3