Let \(M\) be a smooth manifold. Every local chart \((U,\varphi)\) contained in the smooth structure on \(M\) is called smooth chart. The map \(\varphi\) is called smooth coordinate map, and \(U\) is called smooth coordinate domain.
Let \(M\) be a smooth manifold. Every local chart \((U,\varphi)\) contained in the smooth structure on \(M\) is called smooth chart. The map \(\varphi\) is called smooth coordinate map, and \(U\) is called smooth coordinate domain.