By David B. Ellis, Robert Ellis

Concentrating on the function that automorphisms and equivalence family members play within the algebraic concept of minimum units presents an unique therapy of a few key features of summary topological dynamics. Such an method is gifted during this lucid and self-contained ebook, resulting in less complicated proofs of classical effects, in addition to supplying motivation for extra examine. minimum flows on compact Hausdorff areas are studied as icers at the common minimum circulation M. the gang of the icer representing a minimum movement is outlined as a subgroup of the automorphism team G of M, and icers are developed explicitly as relative items utilizing subgroups of G. Many classical effects are then got through analyzing the constitution of the icers on M, together with an explanation of the Furstenberg constitution theorem for distal extensions. This booklet is designed as either a consultant for graduate scholars, and a resource of attention-grabbing new rules for researchers.

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**Additional info for Automorphisms and Equivalence Relations in Topological Dynamics**

**Sample text**

Then f is a proximal homomorphism if and only if Rf ⊂ P (X). Similarly f is distal if and only if Rf ∩ P (X) = , the diagonal in X × X. These are two elementary examples of how the dynamics of the homomorphism f is related to the structure of the icer Rf . 13. 13 says that c is distal if and only if Rc is pointwise almost periodic. This is true for any homomorphism under the assumption that the flow (X, T ) is itself pointwise almost periodic (this is the best we can hope for since ⊂ Rf , so (Rf , T ) pointwise almost periodic implies (X, T ) pointwise almost periodic).

XT ⊂ xA(W0 t)F = xA(W0 t)F ⊂ (W0 t ∩ xT )F ⊂ (W0 ∩ xT )tF ⊂ (W ∩ 4 4 xT )T . 7. xT is minimal. 3 (by 2, 6) We now characterize the almost periodic points of (X, T ) in terms of the minimal idempotents in the enveloping semigroup E(X, T ). 3 Let: (i) (ii) (iii) (iv) (X, T ) be a flow, E = E(X, T ), I ⊂ E be a minimal ideal in E, and x ∈ X. Then the following are equivalent: (a) x is an almost periodic point of X, (b) xT = xI ≡ {xp | p ∈ I }, and (c) there exists u2 = u ∈ I with xu = x. PROOF: (a) ⇒ (b) 1.

Let (x, y) ∈ Rf . 3. There exist a minimal ideal I ⊂ E(X, T ) and an idempotent u ∈ I with xu = x. 3) 4. (x, yu) = (xu, yu) = (x, y)u ∈ Rf u ⊂ Rf . (by 3, Rf is closed and invariant) 5. (y, yu) ∈ Rf . (by 2, 4, Rf is an equivalence relation) 6. (yu, yu) = (y, yu)u ∈ (y, yu)T . 7. (y, yu) ∈ Rf ∩ P (X) = X . (by 1, 5, 6) 8. (x, y) = (x, y)u, so (x, y) is an almost periodic point. 3) The remainder of this section is devoted to a discussion of topological transitivity, the related notion of weak mixing, and their relationship to the ideas introduced so far.