Compact topological spaces

Abbreviation: KTop


A compact topological space is a topological space $\mathbf{X}=\langle X,\Omega\rangle$ that is

compact: every open cover has a finite subcover, i.e., $\forall\mathcal C\subseteq\Omega(\bigcup\mathcal C=X\Longrightarrow\exists n, \exists C_0,\ldots,C_{n-1}\in\mathcal C(C_0\cup\cdots\cup C_{n-1}=X))$

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It is not unusual to give several (equivalent) definitions. Ideally, one of the definitions would give an irredundant axiomatization that does not refer to other classes.


Let $\mathbf{X}$ and $\mathbf{Y}$ be compact topological spaces. A morphism from $\mathbf{X}$ to $\mathbf{Y}$ is a function $h:X\rightarrow Y$ that is a continuous: $\forall V\in\Omega_{\mathbf Y}(h^{-1}[Y]\in\Omega_{\mathbf X})$


A is a structure $\mathbf{A}=\langle A,...\rangle$ of type $\langle ...\rangle$ such that

$...$ is …: $axiom$

$...$ is …: $axiom$


Example 1:

Basic results


Feel free to add or delete properties from this list. The list below may contain properties that are not relevant to the class that is being described.

Classtype second-order
Amalgamation property
Strong amalgamation property
Epimorphisms are surjective


[[Compact Hausdorff topological spaces]]


[[Topological spaces]]