A very important point is always that you can differentiate (uncover a by-product) with a differentiable manifold, and This permits us to note down any dilemma with intervening differential equations (like Newton’s gravitation principle or Einstein’s relativity principle). That is why we phone it «differentiable». Several factors muddy the divide https://modernbookmarks.com/story19120724/the-basic-principles-of-bos138