\Upsilon = \frac{{{F \mathord{\left/ {\vphantom {F A}} \right. \kern-\nulldelimiterspace} A}}}{{{{\Delta L} \mathord{\left/ {\vphantom {{\Delta L} L}} \right. \kern-\nulldelimiterspace} L}}} = \frac{{{\rm{Stress}}}}{{{\rm{Strain}}}}
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