Skeleton of a CW complex
= Skeleton of a CW complex
{title2=$X^q=\bigcup_{\dim e\leq q}e$}
The $q$-skeleton of a <CW complex> is the <subcomplex> consisting of its <topological cells> of dimension at most $q$. A <cellular map> preserves these skeleta. The <cellular approximation theorem> lets continuous maps respect this filtration up to <homotopy>.