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15
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Maximal subgroup disjoint with rationals

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#abstract-algebra #group-theory #modules #direct-sum
34
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Modules with no infinite direct sums of simple summands.

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#modules
181
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Showing a $\mathbb{Z}$-module is not a discrete subset of the complex plane.

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#general-topology #complex-numbers #modules #algebraic-number-theory
47
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Prove a module $R_1$ is not isomorphic to $R_1\oplus R_2$

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#abstract-algebra #modules
36
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'Shift' of a graded ideal

Published on
#abstract-algebra #ring-theory #modules #graded-rings
58
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Graded version of Baer's criterion for injectivity

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#abstract-algebra #ring-theory #modules #graded-rings
58
Views

Proof of the centraliser theorem in Lorenz's "Algebra II"

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#abstract-algebra #ring-theory #proof-explanation #modules #noncommutative-algebra
45
Views

A question about complete Noetherian local $\mathbb{Z}_p$-algebras

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#abstract-algebra #number-theory #ring-theory #commutative-algebra #modules
90
Views

Module homomorphisms that factor through an injective module

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#abstract-algebra #commutative-algebra #category-theory #modules #injective-module
58
Views

Definition of 'cofiber' of a module homomorphism

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#commutative-algebra #category-theory #modules #cofibrations
65
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Induced $G$-module - help with interpretation.

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#abstract-algebra #group-theory #finite-groups #modules #representation-theory
57
Views

Proving that a subset of a free module is a basis using category theory.

Published on
#category-theory #modules #free-modules
44
Views

Prove a set is a basis for a free module if its elements share coefficients with an actual basis.

Published on
#ring-theory #commutative-algebra #modules #free-modules
167
Views

Injective module iff is always a direct summand

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#modules #injective-module
167
Views

Induced module and tensor products.

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#abstract-algebra #group-theory #modules #representation-theory #tensor-products

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