Which one of the following is not a group? (1): (8Z,+) where 8Z = {8n | n € Z} (2): (Z8, +) where the operation is addition modulo 8 (3): (G,+) where the operation is the usual addition and G= {a+b√2 a,b ≤ Q} (4): (H,-) where the operation is the usual multiplication and H = {0,1} (5): (GL(2,Q),-) where the operation is the usual matrix multiplication

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter3: Groups
Section3.2: Properties Of Group Elements
Problem 1E: 1.Prove part of Theorem . Theorem 3.4: Properties of Group Elements Let be a group with respect to a...
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Which one of the following is not a group?
(1): (8Z, +) where 8Z = {8n | n E Z}
(2): (Z8, +) where the operation is addition modulo 8
(3): (G,+) where the operation is the usual addition and
(H₂.)
(B) (8Z,+)
(Z8, +)
(G,+)
G = {a+b√2 a, b e Q}
(4): (H,) where the operation is the usual multiplication and
H = {0,1}
(5): (GL(2,Q),-) where the operation is the usual matrix multiplication
E (GL(2,Q),.)
☐☐
Transcribed Image Text:Which one of the following is not a group? (1): (8Z, +) where 8Z = {8n | n E Z} (2): (Z8, +) where the operation is addition modulo 8 (3): (G,+) where the operation is the usual addition and (H₂.) (B) (8Z,+) (Z8, +) (G,+) G = {a+b√2 a, b e Q} (4): (H,) where the operation is the usual multiplication and H = {0,1} (5): (GL(2,Q),-) where the operation is the usual matrix multiplication E (GL(2,Q),.) ☐☐
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