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<h3 id="Local-bases-of-RT1-element">Local bases of RT1 element<a class="anchor-link" href="#Local-bases-of-RT1-element">&#182;</a></h3><p>Suppose <code>[i,j]</code> is the k-th edge. The two dimensional curl is a rotated graident defined as $\nabla^{\bot} f = (-\partial_y f, \partial _x f).$ For RT0, the basis of this edge along with its divergenc