--- > [!definition]+ Definition. ([[cell]]) > An **open $n$-cell** is any [[topological space]] [[homeomorphism]] to the open ball $\mathbb{B}^{n}$. A **closed $n$-cell** is any [[topological space]] [[homeomorphism]] to the [[closed set|closed]] ball $\overline{\mathbb{B}}^{n}$. ^definition --- #### References > [!backlink] > ```dataview > TABLE rows.file.link as "Further Reading" > FROM [[]] > FLATTEN file.tags as Tag > WHERE Tag = "#definition" OR Tag = "#theorem" OR Tag = "#MOC" OR Tag = "#proposition" OR Tag = "#axiom" > GROUP BY Tag > ``` > [!frontlink] > ```dataview > TABLE rows.file.link as "Further Reading" > FROM outgoing([[]]) > FLATTEN file.tags as Tag > WHERE Tag = "#definition" OR Tag = "#theorem" OR Tag = "#MOC" OR Tag = "#proposition" OR Tag = "#axiom" > GROUP BY Tag > ``` #reformatrevisebatch03