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<p> are defined as the coordinates of  The pair formed by a chart and such a coordinate system is called a <b>local coordinate system</b>, <b>coordinate chart</b>, <b>coordinate patch</b>, <b>coordinate map</b>, or <b>local frame</b>.</p>

<p><big>Formal definition of atlas</big></p>
<p>An <b>atlas</b> for a <a href="page.php?w=topological_space">topological space</a>  is an <a href="page.php?w=indexed_family">indexed family</a>  of charts on  which <a href="page.php?w=Cover_%28topology%29">covers</a>  (that is, ). If for some fixed n, the <a href="page.php?w=image_%28mathematics%29">image</a></p><p>
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