List questions from noncommutative-algebra

Published on 25 Mar 2026 - 7:46

132

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Do flat modules form a reflective subcategory only for semihereditary rings?

Published on 25 Mar 2026 - 11:10

123

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Pairwise Commuting Elements Generating a Certain Subalgebra

Published on 23 Jun 2019 - 15:43

152

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A non-commutative analog of a known result concerning a Jacobian pair

Published on 26 Jun 2019 - 19:46

51

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$k[x,y]$ versus $A_1(k)$

Published on 30 Jun 2019 - 18:48

79

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Is a specific endomorphism of $A_1$ an automorphism?

Published on 02 Jul 2019 - 16:52

101

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Adjoint action as a natural transformation

Published on 10 Jul 2019 - 12:17

310

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Filtered and graded algebras, and the PBW theorem

Published on 13 Jul 2019 - 10:48

143

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If $\{M_\alpha\}$ is a set of irreducible modules, then is $\prod M_\alpha$ completely reducible?

Published on 13 Jul 2019 - 15:32

2.2k

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Non Commutative Polynomial Ring

Published on 15 Jul 2019 - 22:07

461

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Finite Non Commutative Rings of Cardinality n

Published on 23 Feb 2026 - 2:57

94

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Is $M_2(\Bbb R)\otimes_{\Bbb R}\Bbb C\cong M_2(\Bbb C)$?

Published on 17 Jul 2019 - 15:36

309

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Commutator of operators

Published on 18 Jul 2019 - 12:28

137

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Definition of automorphism functor for $\mathbf{Lie}(\mathbf{Aut})(R) = \mathrm{Der}(R).$

Published on 22 Jul 2019 - 10:53

309

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Jacobson radical of a subring

Published on 22 Jul 2019 - 21:22

List Question

Trying to prove the symmetry of a relation in the construction of monoid of left fractions.

Do flat modules form a reflective subcategory only for semihereditary rings?

Pairwise Commuting Elements Generating a Certain Subalgebra

A non-commutative analog of a known result concerning a Jacobian pair

$k[x,y]$ versus $A_1(k)$

Is a specific endomorphism of $A_1$ an automorphism?

Adjoint action as a natural transformation

Filtered and graded algebras, and the PBW theorem

If $\{M_\alpha\}$ is a set of irreducible modules, then is $\prod M_\alpha$ completely reducible?

Non Commutative Polynomial Ring

Finite Non Commutative Rings of Cardinality n

Is $M_2(\Bbb R)\otimes_{\Bbb R}\Bbb C\cong M_2(\Bbb C)$?

Commutator of operators

Definition of automorphism functor for $\mathbf{Lie}(\mathbf{Aut})(R) = \mathrm{Der}(R).$

Jacobson radical of a subring

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