A very important simple fact is one can differentiate (come across a spinoff) with a differentiable manifold, and this allows us to note down any problem with intervening differential equations (like Newton’s gravitation theory or Einstein’s relativity theory). Which is why we phone it «differentiable». About the floor of points, https://bookmarkshq.com/story20946413/new-step-by-step-map-for-bos138