4 ms·
Inconsistent Mathematics
- nabla9 8y ago> Escher also actively collaborated with the English mathematician Roger Penrose. What!!?? ... OK. Somehow I always assumed that Escher lived in 1800s. But he lived (1898 – 1972) and he knew Penrose who is older than I thought (born 1931, 87 years old). I suspected for a moment that the article was intentionally inconsistent, but it checks out.
- elasolova 8y agoA related but more concise set-theoretic discussion is given here: https://philosophy.stackexchange.com/questions/9741/what-are-the-ramifications-of-the-limitations-of-zfc-set-theory https://philosophy.stackexchange.com/questions/9741/what-are...