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<p>About the writhing number, mathematician <a href="page.php?w=William_Francis_Pohl">W. F. Pohl</a> says:</p>

<p><blockquote>It is well known that the writhing number is a standard measure of the global geometry of a closed space curve.</blockquote></p>

<p>Contrary to intuition, a <a href="page.php?w=topology">topological</a> property, the <a href="page.php?w=linking_number">linking number</a>, arises from the <a href="page.php?w=geometry">geometric</a> properties twist and writhe according to the following relationship:<br/>
:L<sub>k</sub>=</p><p>
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