Algebraic varieties with group operations given by morphisms, or group objects in the category of algebraic varieties, the category of algebraic schemes, or closely related categories.

**7**

**0**answers

### Decomposition of linear groups into free products

**4**

**0**answers

### Ext group for commutative finite group schemes

**4**

**1**answer

### (Euclidean) open orbit in an irreducible real algebraic set

**6**

**0**answers

### representability of $\mathrm{R}^1f_{*,\mathrm{fppf}}\mathscr{A}$

**-1**

**1**answer

### $A[x]$ points of an algebraic group

**-1**

**0**answers

### Finite groups with trivial center [closed]

**3**

**2**answers

### Generating Irreducible representations of a simple lie algebra with Schur functors

**9**

**0**answers

### Can elements in the orthogonal group of a non-split Azumaya algebra with an orthogonal involution have reduced norm -1?

**2**

**0**answers

### Valuations of root group elements appearing in the intersection of Iwasawa and Cartan double cosets

**4**

**4**answers

### Fixed Points of the Weyl Group action on a Maximal Torus and the Center of a Reductive Group

**4**

**1**answer

### Existence of Regular Semisimple elements of reductive groups in characteristic 0

**1**

**3**answers

### References request: representations of classical groups

**1**

**1**answer

### Lifting Lang-Steinberg to DVR's in Characteristic 0

**2**

**1**answer

### Do the absolute roots restricting to a given root form a Galois orbit?

**5**

**0**answers

### Restricting projective representations of Lie groups to lattices

**3**

**0**answers

### Special unitary group simply connected?

**2**

**1**answer

### Minimal parabolic subgroups are $G(k)$-conjugate: a cohomological interpretation?

**4**

**0**answers

### Monoid cohomology of $\mathbb{N}$ for a linear algebraic group

**1**

**0**answers

### Group schemes and Hyperspecial maximal compact subgroups

**4**

**0**answers

### Integral structures via lattices

**0**

**0**answers

### What are the corner minors in $Sp(4)$?

**0**

**0**answers

### What is the natural projection of Parabolic subgroups in $Sp(4)$?

**0**

**2**answers

### What is the longest word in type $C_2$ Weyl group written in terms of a matrix?

**1**

**0**answers

### Borel subgroup of $Sp(4,\mathbb{C})$

**1**

**1**answer

### A non trivial example of an anti -affine algebraic group

**2**

**1**answer

### Minuscule cocharacter for reductive groups

**3**

**1**answer

### Possible groups appearing in a Shimura datum

**5**

**1**answer

### Presentation of special linear group over localizations of the integers

**3**

**1**answer

### Diagonalizable pro-algebraic group in Kottwitz's 1985 Compositio paper

**5**

**0**answers

### Hilbert series for invariant ring

**9**

**0**answers

### Naive question about classification of unipotent character sheaves

**4**

**0**answers

### $G$-Invariant Differential Operators

**4**

**0**answers

### Etale cohomology of variety of matrices with given characterestic polynomial

**7**

**2**answers

### Number of points of the nilpotent cone over a finite field and its cohomology

**0**

**0**answers

### Is there a projection from $G$ to the Levi subgroup of a Parabolic subgroup?

**2**

**0**answers

### Under what conditions are superspecial abelian surfaces isomorphic over a finite field?

**1**

**0**answers

### Bijective correspondence between $\mathbb G_a$ actions on affine varieties and exponential maps on affine $k$-domains

**17**

**1**answer

### Is $GL_n(\mathbb{Q}_p)=GL_n(\mathbb{Z}_p)GL_n(\mathbb{Q})$?

**4**

**1**answer

### Legendre's symbol in Schrödinger model for the Weil representation

**0**

**0**answers

### Reference request for a property of Bruhat decomposition

**3**

**1**answer

### Real automorphisms of the “quaternionic” real group ${\rm SO}^*(4m)$

**4**

**0**answers

### Why the hyperoctahedral group is a ``reductive'' group?

**3**

**1**answer

### What is $\rho^{\vee}(-1)$?

**7**

**1**answer

### Example of a connected finite group scheme which is not solvable

**1**

**2**answers

### How to decompose an map $\phi: \mathbb{G}_m \to T$ as the product of a cocharacter $\phi'$ and a map $\phi'':\mathbb{G}_m \to T$?

**3**

**1**answer

### Tits building of a linear algebraic group

**12**

**0**answers

### Representation theory of finite groups with additional structures

**1**

**1**answer

### Functorial description of a certain subgroup scheme

**1**

**1**answer

### Complexification of compact Lie Groups and complex algebraic linear reductive groups

**3**

**0**answers