Leucippus
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His fame was overshadowed by Democritus, and many people denied his existence. Epicurus later distinguished Leucippus from Democritus and credited him with the invention of Atomism. There should be no reason to doubt his existence, but there is very little known about him so many people do doubt that he lived. The system of Atomism was credited to be founded by Leucippus. He believed in the reality of not- being where his atoms moved.