something related to Alexandrov one-point compactification

The topology for $X\bigcup \{\mathrm{\infty }\}$ is defined as follows: there are two kinds of open sets of $X\bigcup \{\mathrm{\infty }\}$. If $\mathrm{\infty }\notin U$, then $U$ is open if and only if $U$ is an open set in the topology of $X$. If $\mathrm{\infty }\in U$, then $U$ is open if and only if $U$ is the complement of a closed compact subset $K$ of $X$.

Title	something related to Alexandrov one-point compactification
Canonical name	SomethingRelatedToAlexandrovOnepointCompactification
Date of creation	2013-03-22 17:03:54
Last modified on	2013-03-22 17:03:54
Owner	adrianita (17056)
Last modified by	adrianita (17056)
Numerical id	4
Author	adrianita (17056)
Entry type	Definition
Classification	msc 54D35