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New posts in group-theory
A condition for a subgroup of a finitely generated free abelian group to have finite index
abstract-algebra
group-theory
abelian-groups
Prove that $G \cong\mathrm{Inn}(G)$ if and only if $Z(G)$ is trivial
abstract-algebra
group-theory
What is, exactly, a discrete group?
group-theory
Explanation why an abelian tower admits a cyclic refinement
abstract-algebra
group-theory
finite-groups
abelian-groups
cyclic-groups
Bijection between two orbit's spaces
group-theory
algebraic-number-theory
automorphic-forms
Why $f$ is an automorphism?
group-theory
Finding the order of the automorphism group of the abelian group of order 8.
linear-algebra
abstract-algebra
group-theory
finite-groups
abelian-groups
Classify all groups containing isomorphic copy of $\mathbb{Z}$ of index $2$.
abstract-algebra
group-theory
infinite-groups
group-extensions
Existence of deep enough open subgroups in profinite groups
group-theory
topological-groups
infinite-groups
profinite-groups
Subgroups of $S_n$ of index $n$ are isomorphic to $ S_{n-1}$
group-theory
finite-groups
symmetric-groups
What are the one-parameter subgroups of GL?
abstract-algebra
group-theory
matrices
reference-request
lie-groups
Can $\mathbb{R}$ be written as an ascending union of proper additive subgroups?
real-analysis
group-theory
axiom-of-choice
infinite-groups
Are elements commutative when subgroups are?
group-theory
examples-counterexamples
The number of subgroups of index two in $G$
abstract-algebra
group-theory
Are the Groups having all subgroups of same order conjugate classified?
abstract-algebra
group-theory
finite-groups
What is this $\Sigma_4 /\langle (12)(34)\rangle$?
abstract-algebra
group-theory
Difference between a group normalizer and centralizer
abstract-algebra
group-theory
The number of $p$-subgroups of a group
group-theory
finite-groups
How to check in GAP whether two groups are isomorphic
group-theory
group-isomorphism
gap
If $G$ is isomorphic to $H$, then ${\rm Aut}(G)$ is isomorphic to ${\rm Aut}(H)$
abstract-algebra
group-theory
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