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<p>is held constant and the other two are allowed to vary, then the resulting surface is called a <b>coordinate surface</b>. For example, the coordinate surfaces obtained by holding ? constant in the <a href="page.php?w=spherical_coordinate_system">spherical coordinate system</a> are the spheres with center at the origin. In three-dimensional space the intersection of two coordinate surfaces is a coordinate curve. In the Cartesian coordinate system we may speak of <b>coordinate planes</b>.Similarly, <b>coordinate hypersurfaces</b> are the (''n''</p><p>
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