Mathematics Homework Solutions

Abelian group

Let G be an Abelian group. show that the set of all elements of G of finite order forms a subgroup of G.

Cyclic groups

Prove or disprove, If G is a group in which every proper subgroup is cyclic, then G is cyclic.

abelian groups

show that a abelian group must have five distinct elements

Subgroups

Show that {(1), (1,2)(3,4), (1,3)(2,4), (1,4)(2,3)} is a subgroup of S4 (Ssub4)

Matrix operations

Let G = GLsub2 (R). a) show that T = {[a b] ad not equal to 0} is a subgroup of G {[0 d] } b) Show that D = {[a 0] ad not equal to 0} is a subgroup of G {[0 d]

Abelian Subgroups

Let G be an abelian group such that the operation on G is denoted additively. Show that {a is an element of G| 2a = 0} is a subgroup of G. Compute the subgroup for G =Z sub 12

Group Equivalence Relation : alpha, beta, sigma

For alpha, beta an element in S sub n, let alpha~ beta if there exists sigma is an element of S sub n such that sigma alpha sigma inverse = beta. Show that ~ is an equivalence relation on S sub n.

Defining a group using axioms.

Define * on Z by a * b = max{a,b}. Is Z a group?

Defining a group using axioms.

Define * on Z by a * b = labl

Defining a group using axioms.

Define * on Q by a * b = ab

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