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<p>that  is a smooth function between any <a href="page.php?w=Manifold">smooth manifolds</a>  and .</p>

<p><big> The differential of a smooth map </big></p>
<p>Let  be a smooth map of smooth manifolds. Given  the <b>differential</b> of  at  is a linear map</p>

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:</p>

<p>from the <a href="page.php?w=tangent_space">tangent space</a> of  at  to the tangent space of  at  The image  of a tangent vector  under  is sometimes called the <b>pushforward</b> of  by  The exact definition of this pushforward depends on the definition one uses for tangent vectors</p><p>
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