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Element of a group G

Source: Brazilian Math Olympiad - University Level - Galois-Noether 2018 #4

November 24, 2019
Setscollege contestsBrazilian Undergrad MO

Problem Statement

Consider the property that each a element of a group GG satisfies a2=ea ^ 2 = e, where e is the identity element of the group. Which of the following statements is not always valid for a group GG with this property? (a) GG is commutative (b) GG has infinite or even order (c) GG is Noetherian (d) GG is vector space over Z2\mathbb{Z}_2