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

3 votes
2 answers
312 views

A minimal continuum

A continuum $X$ is called minimal if it is not a single point and is homeomorphic to all its nontrivial subcontinua. Here a trivial continuum is a single point. … What is an example of a minimal continuum not homeomorphic to the interval? This question is motivated by the following post and its related linked questions. Two consecutive continua …
Ali Taghavi's user avatar
6 votes
1 answer
274 views

"Cyclic" continuum

Here, a curve means a homogeneous metric continuum of dimension 1. Can someone explain this definition in different, more elementary, terms, and give some examples to illustrate the meaning? …
user avatar
2 votes
2 answers
124 views

A contractible non-planar continuum

Consider the contractible continuum $$A=(Z\times[-1,1]\times\{0\})\cup([-1,1]\times\{0\}\times\{0\})\cup(\{0\}\times\{0\}\times[0,1]),$$ which looks like an antenna. … Give a short and correct proof of the non-planarity of the continuum $A$ (maybe with some references). Thank you. …
Taras Banakh's user avatar
  • 41.8k
10 votes
1 answer
312 views

Fractal plane continuum with order $\aleph_0$?

Continuum means compact and connected. … Is there a fractal plane continuum which has order $\aleph_0$ at each of its points? …
D.S. Lipham's user avatar
  • 3,317
4 votes
1 answer
290 views

Why is this continuum circle-like?

A continuum is a compact connected metrizable space. … I was recently surprised by the fact that a continuum $X$ can be both arc-like and circle-like, with the example given by Illanes and Nadler in Hyperspaces being the following continuum, obtained by attaching …
Alessandro Codenotti's user avatar
1 vote
1 answer
140 views

Continuum image of line is chainable?

Let $X$ be a metric continuum (compact + connected) which is the one-to-one continuous image of the interval $[0,\infty)$. Such an $X$ is called a linear continuum. …
Forever Mozart's user avatar
14 votes
1 answer
576 views

How “disconnected” can a continuum be?

A continuum is a compact connected metrizable topological space. … Is it consistent with $\mathsf{ZFC}$ to have a continuum $X$ with $\aleph_0<\mathrm{disc}(X)<\mathfrak c$? …
Alessandro Codenotti's user avatar
7 votes
1 answer
509 views

Example of a non-locally connected continuum

Continuum $=$ compact connected metric space. Let $X$ be a continuum. $X$ is indecomposable means that every proper subcontinuum of $X$ is nowhere dense in $X$. … Given the wealth of examples in continuum theory, the answer is likely no. So what is an example of a decomposable continuum all of whose connected open subsets are dense? …
Forever Mozart's user avatar
10 votes
1 answer
540 views

Is every metric continuum almost path-connected?

By a metric continuum we understand a connected compact metric space. Let $p$ be a positive real number. … By my answer to the question of Anton Petrunin, each plane continuum is almost $\ell_1$-connected. By analogy it can be shown that each continuum in $\mathbb R^3$ is $\ell_2$-connected. Problem. …
Taras Banakh's user avatar
  • 41.8k
10 votes
1 answer
345 views

A forked plane continuum

Suppose $C$ is a plane continuum (i.e. a compact, connected set in the plane), contained in the square $S=[-1,1]^2$, but missing the closed vertical line segment $I = \{0\}\times[0,1]$. … : Does there exist a continuum $C$ (contained in $S$, missing $I$, and containing $P(0,-1)$, $Q(-1,1)$, and $R(1,1)$) such that no matter how we pick $z\in[0,1]$ and a subcontinuum $K_z$ containing …
Mirko's user avatar
  • 1,375
3 votes
0 answers
111 views

Hereditarily Lindelöf spaces with density continuum

Since there are L-spaces (provably in ZFC), under CH we have regular, hereditarily Lindelöf spaces with density continuum. …
GAW's user avatar
  • 31
9 votes
0 answers
197 views

Is each Peano continuum a topological fractal?

Is each Peano continuum a topological fractal? …
Lviv Scottish Book's user avatar
1 vote
0 answers
89 views

Does There Exist a Planar, Linear, Triodic Tree-Like Continuum?

Motivated by Continuum image of line is chainable? A planar continuum $X$ is a compact, connected subset of the plane. …
John Samples's user avatar
15 votes
1 answer
561 views

A continuum which is both Suslinean and non-Suslinean?

Continuum means compact connected metrizable with more than one point. A continuum is Suslinean if every collection of pairwise disjoint subcontinua is countable. … In Example 3 at the end of Paper A, there is constructed a continuum $Y:=X/\sim$ which is the quotient of another continuum $X$. …
D.S. Lipham's user avatar
  • 3,317
4 votes
0 answers
338 views

Does a contractible locally connected continuum have an fixed point property?

Kinoshita proved that contractible continuum do not have FPP, but his example is not locally connected. Maybe if we add this to the conditions it will have FPP? P.S. … Continuum as a nonempty compact connected metric space P.S.2. Asked this question here, but smart guy in comments to his answer advise me publish it here …
LoliDeveloper's user avatar

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