Democritus

According to Leucippus and Democritus, the atom was indivisible. Today we know that is not true.

Plato and Aristotle rejected the ideas of Democritus and Leucippus.

Parmenides wrote about 470 B. C. He is represented as a serious and influential man, with a high moral character. He exercised strong influence upon such philosophers as Plato and Democritus, and was a political power in the city of Elea, of which he was a native. He was not a stranger to the Pythagoreans. The large fragment of his poem is the most ancient monument extant of metaphysical speculation among the Greeks.