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Recent questions tagged group-theory

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1 answer
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1 vote
3 answers
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On a set $A = \{a,b,c,d\}$ a binary operation $*$ is defined as given in the following table. $\begin{array}{|c|cccc|}\hline\text{*}&a&b&c&d\\\hline \text{a}&a&c&b&d\\\text{b}&c&b&d&a\\\text{c}&b&d&a&c\\\text{d}&d&a&c&b\\\hline \end{array}$ The relation is Commutative but not associative Neither commutative nor associative Both commutative and associative Associative but not commutative
asked Mar 30 in Set Theory & Algebra Lakshman Patel RJIT 440 views
6 votes
5 answers
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Let $G$ be a group of $35$ elements. Then the largest possible size of a subgroup of $G$ other than $G$ itself is _______.
asked Feb 12 in Linear Algebra Arjun 2.2k views
0 votes
1 answer
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Consider the following statements: $\mathbf{S_1:}\;\;$If a group $\mathbf{(G,*)}$ is of order $\mathbf n$ and $\mathrm {a \in G}$ is such that $\mathrm {a^m=e}$ for some integer $\mathrm {m \le n}$ then $\mathbf m$ must divide $\mathbf n$. $\mathbf {S_2:}\;\;$If a ... $(3)\;\;\;\text{Niether}\; \mathrm{S_1}\;\text{nor}\;\mathrm{S_2}$
asked Dec 29, 2019 in Set Theory & Algebra Sanjay Sharma 340 views
0 votes
0 answers
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Consider the group $G=\begin{Bmatrix} \begin{pmatrix} a & b \\ 0 & a^{-1} \end{pmatrix} : a,b \in \mathbb{R}, \: a>0 \end{Bmatrix}$ ... $G/N$ is of finite order $N$ is a normal subgroup and the quotient group is isomorphic to $\mathbb{R}^+$ (the group of positive reals with multiplication).
asked Sep 23, 2019 in Set Theory & Algebra Arjun 113 views
0 votes
1 answer
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Let $G$ be a group with identity element $e$. If $x$ and $y$ are elements in $G$ satisfying $x^5y^3=x^8y^5=e$, then which of the following conditions is true? $x=e, \: y=e$ $x\neq e, \: y=e$ $x=e, \: y \neq e$ $x\neq e, \: y \neq e$
asked Sep 23, 2019 in Set Theory & Algebra Arjun 195 views
0 votes
1 answer
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Let $G$ be the group $\{\pm1, \pm i \}$ with multiplication of complex numbers as composition. Let $H$ be the quotient group $\mathbb{Z}/4 \mathbb{Z}$. Then the number of nontrivial group homomorphisms from $H$ to $G$ is $4$ $1$ $2$ $3$
asked Sep 23, 2019 in Set Theory & Algebra Arjun 116 views
0 votes
1 answer
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Let $G$ be a finite group of even order. Then which of the following statements is correct? The number of elements of order $2$ in $G$ is even The number of elements of order $2$ in $G$ is odd $G$ has no subgroup of order $2$ None of the above.
asked May 11, 2019 in Set Theory & Algebra akash.dinkar12 592 views
1 vote
1 answer
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Let $G =\{a_1,a_2, \dots ,a_{12}\}$ be an Abelian group of order $12$ . Then the order of the element $ ( \prod_{i=1}^{12} a_i)$ is $1$ $2$ $6$ $12$
asked May 7, 2019 in Set Theory & Algebra Sayan Bose 808 views
0 votes
1 answer
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Consider the group $G \;=\; \begin{Bmatrix} \begin{pmatrix} a & b \\ 0 & a^{-1} \end{pmatrix}\;: a,b \in \mathbb{R},a>0 \end{Bmatrix}$ ... is of finite order (D) $N$ is a normal subgroup and the quotient group is isomorphic to $\mathbb{R}^{+}$(the group of positive reals with multiplication).
asked Mar 6, 2019 in Set Theory & Algebra ankitgupta.1729 329 views
16 votes
4 answers
12
Let $G$ be an arbitrary group. Consider the following relations on $G$: $R_1: \forall a , b \in G, \: a R_1 b \text{ if and only if } \exists g \in G \text{ such that } a = g^{-1}bg$ $R_2: \forall a , b \in G, \: a R_2 b \text{ if and only if } a= b^{-1}$ Which of the above is/are equivalence relation/relations? $R_1$ and $R_2$ $R_1$ only $R_2$ only Neither $R_1$ nor $R_2$
asked Feb 7, 2019 in Set Theory & Algebra Arjun 5.9k views
0 votes
0 answers
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This a random question came into my mind… Are the below statements true: 1] If a graph is Homomorphic to our graph then it is also Isomorphic to that graph. 2]If a graph is Isomorphic to our graph then it is also Homomorphic graph.
asked Jan 21, 2019 in Set Theory & Algebra Nandkishor3939 183 views
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