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<p>.</p>

<p><big>Topology and smooth structure</big></p>
<p>The tangent bundle comes equipped with a natural topology (not the <a href="page.php?w=disjoint_union_topology">disjoint union topology</a>) and <a href="page.php?w=smooth_structure">smooth structure</a> so as to make it into a manifold in its own right. The dimension of  is twice the dimension of .</p>

<p>Each tangent space of an n-dimensional manifold is an n-dimensional vector space. If  is an open <a href="page.php?w=contractible_space">contractible</a> subset of  , then there is a <a href="page.php?w=diffeomorphism">diffeomorphism</a></p><p>
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