On the classification of one dimensional continua that admit - PowerPoint PPT Presentation

Example: The shift homeomorphism of the dyadic solenoid, Σ 2 , is expansive. Define f : S − → S by f ( x ) = 2 x mod 1. Let Σ 2 = lim − ( S , f ) ← Define the shift homeomorphism � f : Σ 2 − → Σ 2 by f ( x ) = � � f ( � x 1 , x 2 , x 3 ... � ) = � f ( x 1 ) , f ( x 2 ) , f ( x 3 ) , ... � = � f ( x 1 ) , x 1 , x 2 , ... � . Also, notice that � f − 1 ( � x 1 , x 2 , x 3 ... � ) = � x 2 , x 3 , x 4 , ... � . Christopher G. Mouron On the classification of one dimensional continua that admit expansive

Figure: Doubling map f ( x ) = 2 x mod 1. Christopher G. Mouron On the classification of one dimensional continua that admit expansive

Figure: Inverse limit of f ( z ) is the solenoid Σ 2 . Christopher G. Mouron On the classification of one dimensional continua that admit expansive

Theorem The shift homeomorphism on Σ 2 is expansive. Proof. Let the expansive constant be 1 4 .Notice that if x , y ∈ S and d S ( x , y ) < 1 4 then d S ( f ( x ) , f ( y )) = 2d S ( x , y ).Let x , y be distinct elements in Σ 2 . Then there exists i such that x i � = y i .Furthermore, there exists a nonnegative natural number n such that 1 4 < 2 n d S ( x i , y i ) ≤ 1 / 2. Hence, d( � f n − i +1 ( x ) , � d( � f n ( � f − i +1 ( x )) , � f n ( � f n − i +1 ( y )) f − i +1 ( y ))) = d( � f n ( � x i , x i +1 , ... � ) , � = f ( � y i , y i +1 , ... � )) 2 n d S ( x i , y i ) > 1 > 4 . Christopher G. Mouron On the classification of one dimensional continua that admit expa

A homeomorphism is continuum-wise expansive if there exists a constant c > 0 such that for any subcontinuum Y of X there exists an integer n such that diam( h n ( Y )) > c . Every expansive homeomorphism is continuum-wise expansive, but the converse is not true. Christopher G. Mouron On the classification of one dimensional continua that admit expansive

A homeomorphism is positively continuum-wise fully expansive if for every pair ǫ, δ > 0 there is a N ( ǫ, δ ) > 0 such that if Y is a subcontinuum of X with diam( Y ) ≥ δ , then d H ( h n ( Y ) , X ) < ǫ for all n ≥ N ( ǫ, δ ). Christopher G. Mouron On the classification of one dimensional continua that admit expansive

Christopher G. Mouron On the classification of one dimensional continua that admit expansive

Question What properties must a continuum have in order for a continuum to admit and expansive (continuum-wise expansive) homeomorphism? Well, in order for a continuum to admit an expansive (continuum-wise) homeomorphism, all of the proper subcontinuum must be continuous stretched and there must be room for this to happen. This is how indecomposable continua are created. Theorem (Kato) If a G-like continuum admits an expansive homeomorphism, then it must contain an indecomposable subcontinuum. Christopher G. Mouron On the classification of one dimensional continua that admit expa

Theorem (M.) If a k-cyclic continuum admits an expansive homeomorphism, then it must contain an indecomposable subcontinuum. Theorem (Kato) If a continuum admits a positively continuum-wise expansive homeomorphism, then the continuum must be indecomposable. Question Suppose that X is a one-dimensional continuum that admits an expansive homeomorphism, must X be indecomposable? No! Christopher G. Mouron On the classification of one dimensional continua that admit expan

Define f : S − → S by f ( x ) = 2 x mod 1. Let Σ 2 = lim − ( S , f ) ← Then Σ 2 is the dyadic solenoid and as we said before, the shift homeomorphism is expansive. Let � S be the unit circle with 1 sticker in the complex plane and let f : � � → � S − S in the following way: Christopher G. Mouron On the classification of one dimensional continua that admit expansive

Figure: Doubling and stretch map � f ( x ). Christopher G. Mouron On the classification of one dimensional continua that admit expansive

Figure: Inverse limit of � f ( x ) is a ray limiting to the soleniod Christopher G. Mouron On the classification of one dimensional continua that admit expansive

Expansive Homeomorphisms of Plane Continua Christopher G. Mouron On the classification of one dimensional continua that admit expansive

Question Does there exists an expansive homeomorphism of a plane continuum? Yes, the Plykin Attractor is a one dimensional plane continuum that admits an expansive homeomorphism. Christopher G. Mouron On the classification of one dimensional continua that admit expansiv

P Figure: Plykin attractor admits an expansive homeomorphism Christopher G. Mouron On the classification of one dimensional continua that admit expansive

However, the Plykin Attractor is a 1-dimensional 4-separating plane continuum that admits an expansive homeomorphism. Question Does there exist an 1-dimensional plane separating continuum that admits an expansive homeomorphism? No! Christopher G. Mouron On the classification of one dimensional continua that admit expansiv

All 1-dimensional non-separating plane continua are tree-like. (Converse is not true.) Theorem (M.) Tree-like continua do not admit expansive homeomorphisms. The proof of this result contains many important ideas and techniques, so it will be valuable to examine it. Christopher G. Mouron On the classification of one dimensional continua that admit expansiv

Let h : X − → X be a homeomorphism. M is an unstable subcontinuum of h if diam( h n ( M )) → 0 as n → −∞ . M is an stable subcontinuum of h if diam( h n ( M )) → 0 as n → ∞ . Christopher G. Mouron On the classification of one dimensional continua that admit expansive

Theorem (Kato) If h : X − → X is an continuum-wise expansive homeomorphism of a continuum, then there exists a stable or unstable subcontinuum. Since h is expansive if and only if h − 1 is expansive, we will always assume the existence of an unstable subcontinuum. Christopher G. Mouron On the classification of one dimensional continua that admit expansiv

Christopher G. Mouron On the classification of one dimensional continua that admit expansive

Let h : X − → X be a homeomorphism of a continuum X . Define d n k ( x , y ) = max { d( h i ( x ) , h i ( y )) : k ≤ i ≤ n } . And define d n −∞ ( x , y ) = sup { d( h i ( x ) , h i ( y )) : −∞ < i ≤ n } . Christopher G. Mouron On the classification of one dimensional continua that admit expansive

Lemma Let h : X − → X be a homeomorphism of a compact space X. Suppose that 0 < ǫ < c and for each n ∈ N there exists points x n , y n ∈ X such that ǫ/ 3 ≤ d ( x n , y n ) and d n − n ( x n , y n ) < ǫ. Then c cannot be an expansive constant. Christopher G. Mouron On the classification of one dimensional continua that admit expansiv

Proof. There exist converging subsequences { x n ( i ) } ∞ i =1 → x and { y n ( i ) } ∞ i =1 → y . Since d( x n ( i ) , y n ( i ) ) ≥ ǫ/ 3, x and y must be distinct. Since { n ( i ) } ∞ i =1 is strictly increasing, it follows that given k ∈ Z , then − n ( i ) ≤ k ≤ n ( i ) for all i ≥ | k | . So d( h k ( x n ( i ) ) , h k ( y n ( i ) )) < ǫ for all i ≥ | k | . Thus, d( h k ( x ) , h k ( y )) ≤ ǫ < c for all k ∈ Z . Christopher G. Mouron On the classification of one dimensional continua that admit expansiv

On the classification of one dimensional continua that admit - PowerPoint PPT Presentation

On the classification of one dimensional continua that admit expansive homeomorphisms. Christopher G. Mouron Rhodes College July 28, 2016 Christopher G. Mouron On the classification of one dimensional continua that admit expansiv

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