Problem 2. Let G be a fixed group, and define a binary operation x~y if y = gxg‍¹ for some g≤ G. 2.1. Show that ~ defines an equivalence relation on G. 2.2. Show that if two elements x, y Є G are related by y = ~ on G by = gxg¹ for some gЄ G, then y = gang¹ holds for all n € Z+. Conclude that if x ~y, then |x| = |y|. 2.3. Now let G = GL2(R). Is it true that every equivalence class of ~ can be written as [D] for some diagonal matrix D € GL2(R)?

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
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Chapter4: More On Groups
Section4.4: Cosets Of A Subgroup
Problem 24E: Find two groups of order 6 that are not isomorphic.
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Problem 2. Let G be a fixed group, and define a binary operation
x~y if y = gxg‍¹ for some g≤ G.
2.1. Show that ~ defines an equivalence relation on G.
2.2. Show that if two elements x, y Є G are related by y
=
~ on G by
= gxg¹ for some gЄ G,
then y = gang¹ holds for all n € Z+. Conclude that if x ~y, then |x| = |y|.
2.3. Now let G = GL2(R). Is it true that every equivalence class of ~ can be
written as [D] for some diagonal matrix D € GL2(R)?
Transcribed Image Text:Problem 2. Let G be a fixed group, and define a binary operation x~y if y = gxg‍¹ for some g≤ G. 2.1. Show that ~ defines an equivalence relation on G. 2.2. Show that if two elements x, y Є G are related by y = ~ on G by = gxg¹ for some gЄ G, then y = gang¹ holds for all n € Z+. Conclude that if x ~y, then |x| = |y|. 2.3. Now let G = GL2(R). Is it true that every equivalence class of ~ can be written as [D] for some diagonal matrix D € GL2(R)?
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