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<a accesskey="1" href="page.php?w=Flat_(geometry)&amp;p=3">1.Previous</a><br />
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<p>A flat is a <a href="page.php?w=manifold">manifold</a> and an <a href="page.php?w=algebraic_variety">algebraic variety</a>, and is sometimes called a linear manifold or linear variety to distinguish it from other manifolds or varieties.</p>

<p><big>Descriptions</big></p>
<p><big>By equations</big></p>
<p>A flat can be described by a <a href="page.php?w=system_of_linear_equations">system of linear equations</a>.  For example, a line in two-dimensional space can be described by a single linear equation involving  and :<br/>
:In three-dimensional space, a single</p><p>
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