4 ideas
18189 | ZFC could contain a contradiction, and it can never prove its own consistency [MacLane] |
19393 | What is not active is nothing [Leibniz] |
22745 | Pherecydes said the first principle and element is earth [Pherecydes, by Sext.Empiricus] |
5883 | Pherecydes was the first to say that the soul is eternal [Pherecydes, by Cicero] |