Determine whether the following mathematical systems are groups or not. If it's a group, explain why all four group conditions (closure, identity, inverses, associativity) are satisfied. Also, specify if the group is Abelian (commutative). If it's not a group, show at least one of the four group conditions that is not satisfied. a) The set of even whole numbers under addition. (Remember that the number 0 is even since it is a multiple of 2:0 = 2 x 0)

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Problem 1
Determine whether the following mathematical systems are groups or
not. If it's a group, explain why all four group conditions (closure,
identity, inverses, associativity) are satisfied. Also, specify if the group
is Abelian (commutative). If it's not a group, show at least one of the
four group conditions that is not satisfied.
a) The set of even whole numbers under addition.
(Remember that the number 0 is even since it is a multiple of 2:0 = 2 ×0)
Transcribed Image Text:Problem 1 Determine whether the following mathematical systems are groups or not. If it's a group, explain why all four group conditions (closure, identity, inverses, associativity) are satisfied. Also, specify if the group is Abelian (commutative). If it's not a group, show at least one of the four group conditions that is not satisfied. a) The set of even whole numbers under addition. (Remember that the number 0 is even since it is a multiple of 2:0 = 2 ×0)
b)
The set of positive fractions under multiplication.
c) The set of integers under the averaging operation, which takes
the sum of any two integers in this set and divides it by 2.
Transcribed Image Text:b) The set of positive fractions under multiplication. c) The set of integers under the averaging operation, which takes the sum of any two integers in this set and divides it by 2.
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