disprove that H is a subgroup of GL(2, R). 72. Let H {a + bi | a, b E R, ab 0}. Prove or disprove that H is a subgroup of C under addition. 73. Let H= {a + bi a, b E R, a2 b= 1}. Prove or disprove that

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter4: More On Groups
Section4.7: Direct Sums (optional)
Problem 12E
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disprove that H is a subgroup of GL(2, R).
72. Let H {a + bi | a, b E R, ab 0}. Prove or disprove that H is a
subgroup of C under addition.
73. Let H= {a + bi a, b E R, a2 b= 1}. Prove or disprove that
Transcribed Image Text:disprove that H is a subgroup of GL(2, R). 72. Let H {a + bi | a, b E R, ab 0}. Prove or disprove that H is a subgroup of C under addition. 73. Let H= {a + bi a, b E R, a2 b= 1}. Prove or disprove that
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