Abstract Algebra : Structure Theory

Study concepts, example questions & explanations for Abstract Algebra

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Example Questions

Example Question #1 : Structure Theory

identify the following definition. 

Given \displaystyle A is a normal subgroup of \displaystyle B, it is denoted that \displaystyle A/B when the group of left cosets of \displaystyle A in \displaystyle B is called __________.

Possible Answers:

Subgroup

Simple Group

Cosets

Factor Group

Normal Group

Correct answer:

Factor Group

Explanation:

By definition of a factor group it is stated,

Given \displaystyle A is a normal subgroup of \displaystyle B, it is denoted that \displaystyle A/B when the group of left cosets of \displaystyle A in \displaystyle B is called the factor group of \displaystyle B which is determined by \displaystyle A.

Example Question #1 : Structure Theory

Determine whether the statement is true of false:

\displaystyle (aA)(bA)=abA

Possible Answers:

False

True

Correct answer:

True

Explanation:

This statement is true based on the following theorem.

For all \displaystyle a\displaystyle b in \displaystyle G.

If \displaystyle A is a normal subgroup of \displaystyle G then the cosets of \displaystyle A forms a group under the multiplication given by,

\displaystyle (aA)(bA)=abA

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