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PSEUDOCIRCLE

Pseudocircle

Four-point non-Hausdorff topological space

The pseudocircle is the finite topological space X consisting of four distinct points {a,b,c,d} with the following non-Hausdorff topology: { { a , b ,

Pseudocircle

Seifert–Van Kampen theorem

Describes the fundamental group in terms of a cover by two open path-connected subspaces

algebraic topology. Higher-dimensional algebra Mayer–Vietoris sequence Pseudocircle Lee, John M. (2011). Introduction to topological manifolds (2nd ed.)

Seifert–Van Kampen theorem

Seifert–Van_Kampen_theorem

Rational homology sphere

Manifold with the same rational homology groups as a sphere

itself is obviously a rational homology n {\displaystyle n} -sphere. The pseudocircle (for which a weak homotopy equivalence from the circle exists) is a rational

Rational homology sphere

Rational_homology_sphere

List of topologies

List of concrete topologies and topological spaces

example of a totally disconnected discrete space. Finite topological space Pseudocircle − A finite topological space on 4 elements that fails to satisfy any

List of topologies

List_of_topologies

Sierpiński space

Finite topological space with two points, only one of which is closed

List of topologies – List of concrete topologies and topological spaces Pseudocircle – Four-point non-Hausdorff topological space Sierpinski space at the

Sierpiński space

Sierpiński_space

Finite topological space

Mathematical concept

topological spaces with nontrivial fundamental groups. A simple example is the pseudocircle, which is space X with four points, two of which are open and two of

Finite topological space

Finite_topological_space

Hadwiger–Nelson problem

Mathematical problem

Kalai, Gil (2018), Coloring Problems for Arrangements of Circles (and Pseudocircles) Grime, James (February 27, 2019), "A Colorful Unsolved Problem", Numberphile

Hadwiger–Nelson problem

Hadwiger–Nelson_problem

Spanish architecture

Peninsula was the dolmen. The plans of these funerary chambers used to be pseudocircles or trapezoids, formed by huge stones stuck on the ground, and others

Spanish architecture