<P> The length of the half path can be calculated as a function of known quantities as </P> <Dl> <Dd> D = (1 2 v Δ t ′) 2 + L 2 . (\ displaystyle D = (\ sqrt (\ left ((\ frac (1) (2)) v \ Delta t' \ right) ^ (2) + L ^ (2))).) </Dd> </Dl> <Dd> D = (1 2 v Δ t ′) 2 + L 2 . (\ displaystyle D = (\ sqrt (\ left ((\ frac (1) (2)) v \ Delta t' \ right) ^ (2) + L ^ (2))).) </Dd> <P> Elimination of the variables D and L from these three equations results in </P>

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