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<p>* The <b>dimension</b> of a lattice is the same as its <a href="page.php?w=free_module">rank</a> (as a <b>Z</b>-<a href="page.php?w=module_%28mathematics%29">module</a>).<br/>
* The <b>norm</b> of a lattice element a is (a, a).<br/>
* A lattice is <b>positive definite</b> if  the norm of all nonzero elements is positive.<br/>
* The <b>determinant</b> of a lattice is the <a href="page.php?w=determinant">determinant</a> of the <a href="page.php?w=Gram_matrix">Gram matrix</a>, a <a href="page.php?w=matrix_%28mathematics%29">matrix</a> with entries</p><p>
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<a accesskey="3" href="page.php?w=Unimodular_lattice&amp;p=4">3.Next</a>
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