You raise 5 objections 1 What the hell are you talking about Of course we can assume that Achilles is catching the tortoise at constant speed If your aim is to disprove the statement Achilles can not catch the tortoise no matter his speed you are free to assume anything you like about Zeno s speed Are you stupid 2 This is not dubious This is what the whole point of the section is to make clear that a stipulation that Achilles is catching the tortoise at a constant rate or some similar stupulation is necessary for Achilles to catch the tortoise I guess you could include proofs or a link to the harmonic series for example 3 Covered by 1 4 Is pretty obvious 5 This is simply related to the divergence of the harmonic function All it needs is a link The divergence of the harmonic function is not dubious having first being proved in the 14th century Do try and keep up