Newbetuts
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New posts in group-actions
Proving that a group acting freely on a tree is a free group
group-theory
proof-verification
group-actions
trees
Concrete examples of group actions.
group-theory
examples-counterexamples
group-actions
Semidirect product action and its geometry
group-theory
group-actions
exact-sequence
semidirect-product
The unique closed orbit in GIT quotient fibers for polynomial actions of Gl
algebraic-geometry
representation-theory
group-actions
invariant-theory
geometric-invariant-theory
Prove that a non-abelian group of order $pq$ ($p<q$) has a nonnormal subgroup of index $q$
abstract-algebra
finite-groups
proof-verification
group-actions
sylow-theory
About actions of ${\rm Aut}(G)$, conjugacy classes and inner automorphisms of said group
group-theory
group-actions
automorphism-group
Kernel of Group Action
group-theory
group-actions
Quotient space of $\Bbb C^n$ obtained by action of $S_n$
symmetric-groups
group-actions
Smoothness of a G-invariant K-form
lie-groups
smooth-manifolds
differential-forms
group-actions
The order of a conjugacy class is bounded by the index of the center
abstract-algebra
group-theory
group-actions
$S_3$ acting on a subgroup -- confirming my computation is correct
group-theory
finite-groups
group-actions
symmetric-groups
Ergodic action of a group
measure-theory
lie-groups
ergodic-theory
group-actions
Is the symmetry group of a compact subset of $\mathbb{R}^n$ closed?
lie-groups
group-actions
topological-groups
symmetry
isometry
Difficulty showing that a group $G$ applied on $X$, $G_x$ ($x \in X$) & $G_y$, w/ $y \in G(x)$ are same iff $G_x$ is a normal subgroup of $G$. [duplicate]
abstract-algebra
group-theory
group-actions
normal-subgroups
For an action of $G$ on a set, every point of some orbit has the same stabilizer if and only if this stabilizer is a normal subgroup.
group-theory
group-actions
normal-subgroups
Is the fixed point set of an action a submanifold?
differential-geometry
group-actions
Do we gain anything interesting if the stabilizer subgroup of a point is normal?
abstract-algebra
group-theory
group-actions
A group acting on a $p$-group
group-theory
group-actions
p-groups
What does it mean that "the action of $\mathbb{Z}$ on $M$ factors through the quotient $\mathbb{Z}/p^n \mathbb{Z}$"?
number-theory
commutative-algebra
modules
abelian-groups
group-actions
Is $GL_2(\mathbb Z)\cdot X$ a dense subset of $\mathbb R^2$?
real-analysis
general-topology
group-actions
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