User LJR

29 votes

2 answers

5k views

Is $A \times B$ the same as $A \oplus B$?

asked Mar 29, 2013 at 7:47

22 votes

3 answers

10k views

Difference between free groups, free product of two groups, tensor product of two infinite cyclic groups

asked Mar 6, 2012 at 20:07

15 votes

3 answers

3k views

Does every algebraically closed field contain the field of complex numbers?

asked Apr 18, 2013 at 9:11

15 votes

1 answer

106k views

Taylor series in two variables

asked Oct 3, 2011 at 20:11

13 votes

1 answer

778 views

How to prove a Wronskian identity?

asked Jan 29, 2012 at 21:44

13 votes

2 answers

4k views

What is the differences between scheme-theoretical intersection and set-theoretical intersection?

asked Aug 30, 2011 at 18:10

12 votes

1 answer

5k views

Properties of the longest element in a Weyl group

asked Aug 25, 2011 at 23:02

11 votes

2 answers

5k views

What are elements in $SU(1, 1)$?

asked Nov 5, 2012 at 2:40

11 votes

1 answer

2k views

Is supercuspidal representation the same as cuspidal representation?

asked Jun 5, 2014 at 7:53

10 votes

1 answer

4k views

What is the relationship between the root lattice and weight lattice?

asked May 23, 2011 at 15:02

9 votes

1 answer

8k views

difference between eigenspace and generalized eigenspace

asked May 31, 2011 at 14:48

9 votes

1 answer

3k views

How to compute the monodromy group for a given differential equation.

asked Apr 2, 2012 at 3:47

9 votes

1 answer

3k views

How to find a Cartan subalgebra of $so(3)$.

asked Jul 7, 2016 at 3:07

8 votes

1 answer

136 views

How to compute the limit $\lim_{n \to \infty} (1 + 2^n + 3^n +4^n+5^n)^{1/n}$?

asked Dec 24, 2014 at 9:19

8 votes

1 answer

1k views

Examples of non-split algebraic groups.

asked Sep 11, 2015 at 2:30

8 votes

1 answer

2k views

How to show that the cohomology of a Grassmannian has a basis consisting of the equivalent classes represented by Schubert cycles?

asked Sep 17, 2011 at 4:04

8 votes

3 answers

2k views

how to compute the Euler characters of a Grassmannian?

asked Jun 14, 2011 at 12:56

8 votes

1 answer

3k views

Inner product for a finite dimensional vector space

asked Apr 5, 2013 at 13:36

8 votes

1 answer

451 views

Different definitions of rational mappings.

asked Jul 15, 2013 at 8:36

8 votes

1 answer

2k views

How to compute radical and unipotent radical of an algebraic group?

asked Dec 10, 2013 at 12:52

8 votes

3 answers

1k views

How to show that $\Delta\left(\frac{az+b}{cz+d}\right)=(cz+d)^{12}\Delta(z)$?

asked Dec 12, 2013 at 15:47

7 votes

1 answer

2k views

What is the group of $k$-rational points of an algebraic group?

asked Jan 21, 2014 at 16:56

7 votes

1 answer

2k views

The longest word in Weyl group and positive roots.

asked Aug 10, 2012 at 16:01

7 votes

3 answers

3k views

What are the differences among an affine variety, a vector space, and a projective variety?

asked Jun 17, 2011 at 1:10

7 votes

1 answer

1k views

Question about Weyl character formula

asked Aug 26, 2011 at 17:37

7 votes

1 answer

199 views

How to show that $\lim_{n \to \infty} a_n^{1/n} = l$?

asked Dec 24, 2014 at 9:24

7 votes

2 answers

11k views

Simultaneously diagonalization of two matrices.

asked Dec 24, 2014 at 9:00

7 votes

1 answer

2k views

Split groups and quasi-split groups.

asked Jun 12, 2014 at 6:59

6 votes

1 answer

2k views

Characters on a torus.

asked Jun 9, 2014 at 9:43

6 votes

1 answer

868 views

Express fundamental coweights using coroots.

asked Feb 25, 2016 at 3:25

Stack Exchange Network

649 Questions

Is $A \times B$ the same as $A \oplus B$?

Difference between free groups, free product of two groups, tensor product of two infinite cyclic groups

Does every algebraically closed field contain the field of complex numbers?

Taylor series in two variables

How to prove a Wronskian identity?

What is the differences between scheme-theoretical intersection and set-theoretical intersection?

Properties of the longest element in a Weyl group

What are elements in $SU(1, 1)$?

Is supercuspidal representation the same as cuspidal representation?

What is the relationship between the root lattice and weight lattice?

difference between eigenspace and generalized eigenspace

How to compute the monodromy group for a given differential equation.

How to find a Cartan subalgebra of $so(3)$.

How to compute the limit $\lim_{n \to \infty} (1 + 2^n + 3^n +4^n+5^n)^{1/n}$?

Examples of non-split algebraic groups.

How to show that the cohomology of a Grassmannian has a basis consisting of the equivalent classes represented by Schubert cycles?

how to compute the Euler characters of a Grassmannian?

Inner product for a finite dimensional vector space

Different definitions of rational mappings.

How to compute radical and unipotent radical of an algebraic group?

How to show that $\Delta\left(\frac{az+b}{cz+d}\right)=(cz+d)^{12}\Delta(z)$?

What is the group of $k$-rational points of an algebraic group?

The longest word in Weyl group and positive roots.

What are the differences among an affine variety, a vector space, and a projective variety?

Question about Weyl character formula

How to show that $\lim_{n \to \infty} a_n^{1/n} = l$?

Simultaneously diagonalization of two matrices.

Split groups and quasi-split groups.

Characters on a torus.

Express fundamental coweights using coroots.