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<p>important results in continuum mechanics require the derivatives of vectors with respect to vectors and of <a href="page.php?w=tensors">tensors</a> with respect to vectors and tensors.  The directional derivative provides a systematic way of finding these derivatives.</p>

<p><big>See also</big></p>
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<p><big> Notes </big></p>
<p><big> References </big></p>
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<p><big> External links </big></p>
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* at <a href="page.php?w=MathWorld">MathWorld</a>.<br/>
*</p><p>
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