Translations:Fermat’s principle - book/3/en
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}{v_Template:\rm 1}{\rm +}\frac{s_Template:\rm 1}{v_Template:\rm 1}{\rm +}\cdots {\rm +}\frac{s_m}{v_m}, \mathrm{or} t{\rm =}\sum^m_{i{\rm =1}}{\frac{s_j}{v_i}}, \end{align} </math>|}}