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Reference.org
Length function
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<p>In the <a href="/facts/Mathematics/pxTouaz4">mathematical</a> field of <a href="/facts/Geometric_group_theory/AJhxpFUe">geometric group theory</a>, a length function is a <a href="/facts/Function_(mathematics)/CdReEKCh">function</a> that assigns a number to each element of a <a href="/facts/Group_(mathematics)/IQTYqINt">group</a>. </p>