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Continuum theory, point-set topology, spaces with algebraic structure, foundations, dimension theory, local and global properties.
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Two consecutive continua
Are there two non homeomorphic continua $X,Y$ such that $X $ can be embedded in $Y$ but there is no topological space $Z$ with $$X<Z<Y.$$
The later relation means that $Z$ is homeomorphic …
1
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0
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79
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Difference between planar sub-continua and sub-continua on the surface $\mathbb{T}^2$?
Can anyone tell me what is the essential difference between planar sub-continua and sub-continua of the torus? I will appreciate if you can give me some references. …
4
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4
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597
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A question about indecomposable continua.
It is known that a compact
"indecomposable continuum" has uncountably many proper infinite subsets that are themselves
"continua". … If C is a non-compact "indecomposable continuum" and S is the set of all its proper infinite subsets that are themselves "continua", what can be said about the cardinal number
of S? …
7
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3
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310
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Non-metric topological continua
What important results hold for non-metric continua, or where can I find a survey of such results? …
8
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1
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Beautiful examples of arc-like continua
Arc-like continua are also called "snake-like" or "chainable" continua. For more background, see Nadler's excellent textbook 'Continuum Theory: An Introduction'. … I am writing a paper that involves arc-like continua, and I would be interested to know:
Are there other interesting examples of arc-like continua that lend themselves to making nice and illuminating computer …
9
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0
answers
210
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Continuous maps between Peano continua
Using that we can deduce that for nondegenerate Peano continua $X, Y$, the spaces $C(X, I)$ and $C(I, Y)$ are quite rich and consequently the space $C(X,Y)$ (considered with the uniform topology) is quite … Questions: Are the following conditions true for all nondegenerate Peano continua $X, Y$?
The point $id\in C(X,X)$ is not isolated.
The space $C(X,Y)$ does not contain an isolated point. …
4
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1
answer
222
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Is there an uncountable family of "hereditarily unembeddable" continua?
Define a family $\{C_i\}_{i\in I}$ of continua, that is compact connected metrizable spaces, to be hereditarily unembeddable (a name I just made up) iff for all $i\neq j$ no nontrivial subcontinuum of … Is there an uncountable family of continua which is hereditarily unembeddable? Is there such a family made of planar continua? …
2
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1
answer
288
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Snake-like continua and universal images
The snake-like continua $\ S\ $ are universal images for Hausdorff compact spaces in the following sense:
THEOREM Let $\ S\ $ be an arbitrary snake-like continuum. … The questions is: are the snake-like continua the only universal images for the Hausdorff connected spaces? …
6
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2
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427
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Do mixing homeomorphisms on continua have positive entropy?
I have read that expansive homeomorphisms on continua, for example, have positive entropy. But I do not know whether another property called mixing also implies positive entropy. …
2
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130
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For which continua $X$ does $X^\mathbb{N}$ have the fixed-point property?
In the context of continua (i.e., non-empty compact connected metric spaces) in particular, it's well known that $X^\mathbb{N}$ is homeomorphic to the Hilbert cube, $[0,1]^\mathbb{N}$, for any dendrite … For which continua $X$ does $X^\mathbb{N}$ have the fixed-point property? …
11
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372
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Examples of continua that are contractible but are not locally connected at any point
What are examples of continua that are contractible but nowhere locally connected, meaning that no point has a neighbourhood basis consisting of connected sets? …
4
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3
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354
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End points of continua
Whyburn (1942) defined an end point $x$ of a continuum $X$ to be any point having arbitrarily small neighborhoods each of whose boundaries contains a single point. Thus, he defines an end point local …
2
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0
answers
159
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Are there hereditarily square-boxed plane continua?
I have no reason to believe that my proof for the graph-of-a-function case would easily generalize for arbitrary plane continua, so I don't know how
difficult might the last question be. … It is well known that path-connected is equivalent to arc-connected (for plane continua), that is there is an arc $\gamma:[0,1]\to C$ with $\gamma(0)=D$ and $\gamma(1)=E$. …
4
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0
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158
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Which Topological Spaces are Powers?
The only result of this type I know relates to continua. Since the product of two arbitrary continua is always aposyndetic, we can guarantee that any non-aposyndetic continuum does not have a factor. …
14
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1
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576
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How “disconnected” can a continuum be?
It is a standard result that continua are $\aleph_0$-connected and, by writing a continuum as a union of singletons, it is clear that continua are $\mathfrak c$-disconnected. … Is it a theorem of $\mathsf{ZFC}$ that if $X$ and $Y$ are nontrivial continua, then $\mathrm{disc}(X)=\mathrm{disc}(Y)$? …