(Topology Problem) Finding an interesting homeomorphism

In summary, the problem is asking for an explicit homeomorphism between the sets NxNx[0,1) and [0,1). A function f is a homeomorphism if it is bijective, continuous, and its inverse is also continuous. The proposed solution involves using a function g that maps [0,1) to N and an identity function h that maps [0,1) to itself. However, since [0,1) is uncountable and N is countably infinite, this approach may not work. Additionally, [0,1) is a connected set while NxNx[0,1) is not connected, which suggests that they are not homeomorphic. However, if NxNx[0,
  • #1
GridironCPJ
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0

Homework Statement


NxNx[0,1) is homeomorphic to [0, 1). Find an explicit homeomorphism.
(Note that N=naturals)


Homework Equations


A function f is a homeomorphism if:
(1) f is bijective
(2) f is continuous
(3) f inverse is continuous


The Attempt at a Solution


Finding a map from [0, 1) to NxNx[0, 1) seems easier. So, we would have a function of the following structure:

F([0, 1))=(g([0,1)), g([0, 1)), h([0, 1))) s.t. g([0, 1))=N and h([0, 1))=[0, 1), so clearly h is just the identity function, which is clearly bijective. Now, the question is how to get a function g that is bijective. [0, 1) is uncountable and N is countably infinite, so the cardinalities do not correspond. Perhaps my idea will not work. Let me know what you all think and feel free to express any other ideas.
 
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  • #2
I don't believe for a second that [itex]\mathbb{N}\times \mathbb{N}\times [0,1)[/itex] is homeomorphic to [itex][0,1)[/itex].
 
  • #3
For one thing, [0, 1) is a connected set. NxNx[0, 1) is not connected.
 
  • #4
Whoops, I forgot to mentione that NxNx[0,1) has the dictionary order topology. Does this change your mind?
 

Related to (Topology Problem) Finding an interesting homeomorphism

1. What is a homeomorphism?

A homeomorphism is a continuous and bijective mapping between two topological spaces that has a continuous inverse. In simpler terms, it is a way of transforming one space into another while preserving its essential properties.

2. Why is finding an interesting homeomorphism important in topology?

Finding an interesting homeomorphism can reveal important insights and connections between seemingly different topological spaces. It can also help in solving difficult topological problems and creating new mathematical structures.

3. How do you determine if two spaces are homeomorphic?

There are several ways to determine if two spaces are homeomorphic. One method is to compare their topological properties such as connectedness, compactness, and dimensionality. Another approach is to look for a continuous and bijective function between the two spaces and check if it has a continuous inverse.

4. Can you give an example of an interesting homeomorphism?

One example of an interesting homeomorphism is the mapping between a coffee mug and a donut. Both objects may seem different at first glance, but they can be transformed into each other without tearing or gluing, making them homeomorphic.

5. What are some real-world applications of finding interesting homeomorphisms?

Finding interesting homeomorphisms has many applications in different fields, such as physics, computer science, and biology. In physics, it is used to study the properties of space and time. In computer science, it can help in data compression and pattern recognition. In biology, it can aid in understanding the shape and structure of biological molecules.

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