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<div style="float:center; width:85%; padding:15px; background: white; border: 1px solid blue;
margin-left:8px; margin-right:8px;margin-bottom:15px; text-align:left">
:<math>d^k = <\mathbf x, \nabla>^k</math>
:<math>D_{\hat \mathbf v}^k = <\hat \mathbf v,\nabla>^k</math>
</div>
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contributi