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Julian Kuelshammer's user avatar
Julian Kuelshammer's user avatar
Julian Kuelshammer's user avatar
Julian Kuelshammer
  • Member for 12 years, 9 months
  • Last seen more than a week ago
19 votes

Non-unital module over a ring with identity?

14 votes

Is there any non-monoid ring which has no maximal ideal?

14 votes
Accepted

Prove that if $A - A^2 = I$ then $A$ has no real eigenvalues

13 votes

How to prove a matrix is nilpotent?

13 votes
Accepted

Question for recommending a good textbook in representation of quivers

11 votes
Accepted

Why are these all the indecomposable projective modules?

10 votes
Accepted

Need some help settling a bet

10 votes

Endomorphisms of a ring $R$ considered as $R$-module

9 votes
Accepted

Infinite irreducible representation of a finite group

8 votes

Isomorphism of sets

8 votes
Accepted

Path Algebra for Categories

8 votes
Accepted

Global dimension of quasi Frobenius ring

8 votes
Accepted

Projective indecomposables versus general indecomposables

6 votes
Accepted

solve system of linear congruences mod 13

6 votes

How do we find the inverse of a vector function with $2$ variables?

6 votes

In stating that the union of vector subspaces is a subspace iff they are ordered, why require $F$ finite?

6 votes
Accepted

Are (semi)-simple Lie algebras not solvable?

6 votes
Accepted

what is the definition of restricted direct product ?

5 votes
Accepted

Computing Path Algebra of a Quiver

5 votes
Accepted

Does the projectively stable category have projective modules?

5 votes
Accepted

Bases and linearly independent sets in free R-modules

5 votes

hausdorff space and continuous function

5 votes

structure of modules over $\mathbb{Z}^n$

5 votes

Prove that if matrix $A$ is nilpotent, then $I+A$ is invertible.

5 votes
Accepted

Trivial extension of an algebra

5 votes
Accepted

Does tensoring by a flat module preserve pullbacks of pairs of monos?

4 votes
Accepted

Splitting idempotents

4 votes
Accepted

Difference between a ring with 1 and an associative algebra

4 votes

Does this isomorphism hold?

4 votes

Indecomposable rings with nontrivial idempotents

1
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