 In the case under consideration both the velocity of Plato (\(v_p\)) and the velocity of Socrates (\(v_s\)) are infinitesimal for time t approaching zero. Two infinitesimals are said to be of different order if the limit of their quotient is either zero or infinite. In the case under consideration the limit of the quotient \(v_p/v_s\) as \(t\rightarrow 0\) is infinite. (Wilson 1960: 55)