if thanos kept wiping out half the universe still he wouldn't get all life forms in the universe to become zero.,(reply>), Not really, you can only keep dividing by 2 indefinitely from a mathematical standpoint. In a physical standpoint, you're eventually going to end up with a unitary value which in this case is the last living organism in the universe. At that point your existence would cause an imbalance at which point the logical solution is to snap yourself out of existence