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<p><a href="page.php?w=Group_action_%28mathematics%29">action</a> of the integer <a href="page.php?w=lattice_%28group%29">lattice</a> <b>Z</b><sup>3</sup> (with the action being taken as vector addition). Equivalently, the 3-torus is obtained from the 3-dimensional <a href="page.php?w=cube">cube</a> by gluing the opposite faces together.</p>

<p>A 3-torus in this sense is an example of a 3-dimensional <a href="page.php?w=Compact_space">compact</a> <a href="page.php?w=manifold">manifold</a>. It is also an example of a compact <a href="page.php?w=abelian_group">abelian</a></p><p>
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