LJR

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abstract-algebra

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Questions

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29

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

Mar 29, 2013

22

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

Mar 6, 2012

15

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

Apr 18, 2013

15

Taylor series in two variables

Oct 3, 2011

13

How to prove a Wronskian identity?

Jan 29, 2012

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6

$\langle 2,x \rangle$ is a non-principal ideal in $\mathbb Z [x];\, $ $D[x]$ PID $\Rightarrow D$ field, for a domain $D$

Oct 23, 2014

4

What is the relationship between Cartan matrices and Coxeter matrices?

Mar 21, 2017

4

An identity about antipode in a Poisson Hopf algebra.

Jan 21, 2017

3

Questions about Haar integral for the group $GL_2(\mathbb{R})$.

Dec 26, 2013

3

How to show that $\pi \cot \pi \tau = \pi i - 2 \pi i \sum_{m=1}^{\infty} q^m$?

Sep 3, 2013

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abstract-algebra

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representation-theory

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ring-theory

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hopf-algebras

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ideals

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Find a maximal set of independent equations in a system of non-linear equations.

+10

If $H$ is a Hopf algebra, do we have $H^{cop}$ is a Hopf algebra?

+10

How to find the longest element in a double coset of a Weyl group using SageMath?

+10

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

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