An important simple fact is the fact one can differentiate (find a by-product) on a differentiable manifold, and this allows us to notice down any issue with intervening differential equations (like Newton’s gravitation principle or Einstein’s relativity theory). That may be why we get in touch with it «differentiable». Historically, https://myfirstbookmark.com/story19353421/an-unbiased-view-of-bos138