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Continuum theory, point-set topology, spaces with algebraic structure, foundations, dimension theory, local and global properties.

1 vote
1 answer
130 views

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 …
Ali Taghavi's user avatar
1 vote
0 answers
79 views

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. …
Yee Neil's user avatar
4 votes
4 answers
597 views

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? …
Garabed Gulbenkian's user avatar
7 votes
3 answers
310 views

Non-metric topological continua

What important results hold for non-metric continua, or where can I find a survey of such results? …
Irina's user avatar
  • 504
8 votes
1 answer
1k views

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 votes
0 answers
210 views

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. …
Benjamin Vejnar's user avatar
4 votes
1 answer
222 views

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? …
Alessandro Codenotti's user avatar
2 votes
1 answer
288 views

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? …
Włodzimierz Holsztyński's user avatar
6 votes
2 answers
427 views

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. …
D.S. Lipham's user avatar
  • 3,317
2 votes
1 answer
130 views

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? …
James E Hanson's user avatar
11 votes
1 answer
372 views

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? …
TopologicalDynamitard's user avatar
4 votes
3 answers
354 views

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 …
R. Johnson's user avatar
2 votes
0 answers
159 views

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 $\gamma(1)=E$. …
Mirko's user avatar
  • 1,375
4 votes
0 answers
158 views

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. …
Daron's user avatar
  • 1,955
14 votes
1 answer
576 views

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 $\mathrm{disc}(X)=\mathrm{disc}(Y)$? …
Alessandro Codenotti's user avatar

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