Topological equivalence (2024)

In topology: Topological equivalence

\n\nThe motions associated with a continuous deformation from one object to another occur in the context of some surrounding space, called the ambient space of the deformation. When a continuous deformation from one object to another can be performed in a particular ambient… \n

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homeomorphism

  • In homeomorphism

    Two spaces are called topologically equivalent if there exists a homeomorphism between them. The properties of size and straightness in Euclidean space are not topological properties, while the connectedness of a figure is. Any simple polygon is homeomorphic to a circle; all figures homeomorphic to a circle are called…\n

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  • Topological equivalence (8)

    In topology: Topological equivalence

    The motions associated with a continuous deformation from one object to another occur in the context of some surrounding space, called the ambient space of the deformation. When a continuous deformation from one object to another can be performed in a particular ambient…

    Read More

homeomorphism

  • In homeomorphism

    Two spaces are called topologically equivalent if there exists a homeomorphism between them. The properties of size and straightness in Euclidean space are not topological properties, while the connectedness of a figure is. Any simple polygon is homeomorphic to a circle; all figures homeomorphic to a circle are called…

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Topological equivalence (2024)

FAQs

How to prove topologically equivalent? ›

Two flows and in are topologically equivalent iff their equilibria, ordered on the line, can be put into one-to-one correspondence and have the same topological type (sink, source or semistable).

What is an example of topological equivalence? ›

A classic example of two topologically equivalent objects is that of a donut and a coffee mug. The hole in the donut becomes the handle for the coffee cup, and the remaining changes are made via a series of hypothetical deformations.

How do you show two metrics are topologically equivalent? ›

Two metrics d1 and d2 on a space X are topologically equivalent if and only if a subset U of X which is open in (X, d1) is open in (X, d2). a) f : X → Y is continuous from (X, d1) to (Y,dY ) if and only if it is continuous from (X, d2) to (Y,dY ).

What is topology equivalence? ›

Two spaces are called topologically equivalent if there exists a homeomorphism between them. The properties of size and straightness in Euclidean space are not topological properties, while the connectedness of a figure is. Any simple polygon is homeomorphic to a circle; all figures homeomorphic to a circle are called…

How do you prove equivalent statements? ›

Two logical statements are logically equivalent if they always produce the same truth value. Consequently, p≡q is same as saying p⇔q is a tautology. Beside distributive and De Morgan's laws, remember these two equivalences as well; they are very helpful when dealing with implications.

What is a human topologically equivalent to? ›

But if you want the straight up answer, a human is topologicaly equivalent to a 7 hole donut. I assume you are thinking of the digestive tract. However, the nose & septum introduce two more holes, so actually it is a “three holed torus.”

What are topologically equivalent things? ›

Topology is the study of shapes and of spaces. The notion of “sameness” in topology is called topological equivalence; let's have a look: Definition. Two figures are topologically equivalent if if one figure can be transformed into the other by twisting and stretching, but not tearing, cutting, or gluing.

Are all polygons topologically equivalent? ›

It is intuitively evident that all simple closed curves in the plane and all polygons are topologically equivalent to a circle; similarly, all closed cylinders, cones, convex polyhedra, and other simple closed surfaces are equivalent to a sphere.

What is the topological equivalence relation? ›

An equivalence relation between topological spaces. Two topological spaces X and Y are said to be topologically equivalent (or homeomorphic), if there exists a homeomorphism, continuous map between the spaces, H∈C0(X,Y) which has a continuous inverse H−1∈C0(Y,X).

What numbers are topologically equivalent? ›

1) The numbers 0, 4, 6, 9 are topologically equivalent. 2) The numbers 1, 2, 3, 5, 7 are topologically equivalent. 3) The number 8 is not topologically equivalent to any other digit. 2) Cutting the corners of the cube produces 8 new faces and renders the old faces octagonal.

How do you prove two metrics are equivalent? ›

Two metrics are equivalent if they give rise to the same topology. So you need to show that if a set is open in the topology induced by the dp metric, then it is also open in the topology induced by the dw metric, and vice-versa.

What is topologically equivalent network? ›

A pair of networks are topologically equivalent if one can be distorted to fit exactly onto the other. To demonstrate equivalence, you have to identify which vertices match up and show that the arcs in each network have the same relationship with the vertices.

How to show two topologies are equal? ›

Two topological spaces (X,τ),(Y,σ) ( X , τ ) , ( Y , σ ) are said to be equivalent or homeomorphic if there exists a 1–1 onto function f:(X,τ)→(Y,σ) f : ( X , τ ) → ( Y , σ ) such that for all V∈σ V ∈ σ , we have that f−1(V)∈τ f − 1 ( V ) ∈ τ and the same holds for f−1 .

What are the three basic topological relationships? ›

Three basic topological relationships are usually stored: connectivity, adjacency, and enclosure. Connectivity describes how lines are connected to each other to form a network. Adjacency describes whether two areas are next to each other, and enclosure describes whether two areas are nested.

What are the two 2 types of topology? ›

There are two types of network topologies: physical and logical. Physical topology emphasizes the physical layout of the connected devices and nodes, while the logical topology focuses on the pattern of data transfer between network nodes.

How do you prove something is a topological property? ›

Alternatively, a topological property is a proper class of topological spaces which is closed under homeomorphisms. That is, a property of spaces is a topological property if whenever a space X possesses that property every space homeomorphic to X possesses that property.

How do you prove sets are equivalent? ›

To be equivalent, the sets should have the same cardinality. This means that there should be one to one correspondence between elements of both the sets. Here, one to one correspondence means that for each element in the set A, there exists an element in the set B till the sets get exhausted.

How do you prove a basis for a topology? ›

Let (X,T ) be a topological space. Show that a collection B of subsets of X is a basis for T if and only if it satisfies the following two conditions: (i) Every basis element is an open set, that is, B⊆T . (ii) For every open set U ∈ T , and every x ∈ U, there exists some element B ∈ B such that x ∈ B and B ⊆ U.

How do you prove a set is a topology? ›

Definition: A topology on a set X is a collection T of subsets of X having the following properties: (i) ∅ and X are in T. (ii) The union of the elements of any sub-collection of T is in T. (iii) The intersection of the elements of any finite sub-collection of T is in T.

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