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- Reflexive Generalized Inverse - Mathematics Stack Exchange
Definition: G is a generalized inverse of A if and only if AGA=A G is said to be reflexive if and only if GAG=G I was trying to solve the problem: If A is a matrix and G be it's generalized inverse then G is reflexive if and only if rank (A)=rank (G)
- abstract algebra - $gAg^ {-1} \subset A$ implies $gAg^ {-1} = A . . .
I am trying to prove that $gAg^ {-1} \subset A$ implies $gAg^ {-1} = A$, where A is a subset of some group G, and g is a group element of G This is stated without proof in Dummit and Foote
- Prove the centralizer of an element in group $G$ is a subgroup of $G$
We have a group $G$ where $a$ is an element of $G$ Then we have a set $Z (a) = \ {g\in G : ga = ag\}$ called the centralizer of $a$ If I have an $x\in Z (a)$, how
- Conjugacy Classes of the Quaternion Group $Q$
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- Let $a \in G$. Show that for any $g \in G$, $gC (a)g^ {-1} = C (gag . . .
Try checking if the element $ghg^ {-1}$ you thought of is in $C (gag^ {-1})$ and then vice versa
- abstract algebra - Show that conjugate by $g$ is isomorphism . . .
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- abstract algebra - Centralizer and Normalizer as Group Action . . .
The stabilizer subgroup we defined above for this action on some set $A\subseteq G$ is the set of all $g\in G$ such that $gAg^ {-1} = A$ — which is exactly the normalizer subgroup $N_G (A)$!
- Group relations: Prove that $\forall u,v\in G$, $uv\sim vu$
Prove that the relation $a\sim b$ if $b=gag^ {-1}$ for some $g\in G$, is an equivalence relation on $G$ Prove that $\forall u,v\in G$, $uv\sim vu$ So I've proved (1) My confusion lies in the fact that they appear to be the same question I'm sure I must be wrong, but my approach was to again show that $\sim$ is an equivalence relation
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