Full Idea
Zeno was concerned with three increasingly abstract problems of motion: the infinitesimal, the infinite, and continuity; to state the problems is perhaps the hardest part of the philosophical task, and this was done by Zeno.
Gist of Idea
Zeno achieved the statement of the problems of infinitesimals, infinity and continuity
Source
comment on Zeno (Citium) (fragments/reports [c.294 BCE]) by Bertrand Russell - Mathematics and the Metaphysicians p.81
Book Reference
Russell,Bertrand: 'Mysticism and Logic' [Unwin 1989], p.81
A Reaction
A very nice tribute, and a beautiful clarification of what Zeno was concerned with.