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<math display="block">t \leq \frac{N}{\operatorname{min} (v_1,..., v_{n-1})}.</math>
Rifford confirmed this conjecture for <math>n=3,4,5,6</math> and showed that the minimal <math>N</math> in each case is given by <math>N=1</math> for <math>n=3,4,5</math> and <math>N=2</math> for <math>n=6</math>. The latter result (<math>N=2</math> for <math>n=6</math>) shows that if we consider six runners starting from <math>0</math> at time <math>t=0</math> with constant speeds <math>v_0,v_1,...,v_{5}</math> with <math>v_0=0</math>
and <math>v_1,...,v_{5}</math> distinct and positive then the static runner is separated by a distance at least <math>1/6</math> from the others during the first two rounds of the slowest non-static runner (but not necessary during the first round).
=== Other results ===
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