Lemma 4.3 Assume • T(0) = Idx; • T(t +s) = T(t)T(s) (t, s 2 0); • Vx€ X :xH T(t)x is continuous in 0. Then T is a Co-semigroup.

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 32E: Prove statement d of Theorem 3.9: If G is abelian, (xy)n=xnyn for all integers n.
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Prove lemma 4.3 in the given picture

Lemma 4.3 Assume
• T(0) = Idx;
• T(t + s) = T(t)T(s) (t, s 2 0);
• Vr€ X :rH T(t)x is continuous in 0.
Then T is a Co-semigroup.
Transcribed Image Text:Lemma 4.3 Assume • T(0) = Idx; • T(t + s) = T(t)T(s) (t, s 2 0); • Vr€ X :rH T(t)x is continuous in 0. Then T is a Co-semigroup.
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