This happens fairly frequently in long-distance relationships, especially in military ones, and it erodes a fundamental part of intimacy—people stop feeling like they're connected.

The method of fundamental solutions(MFS), one of the radial basis function(RBF) methods, employs the fundamental solutions to the governing differential operator as the Euclidean distance based RBF.

As an important component part of the modern distance education project, the material library of education resources is organized and built in the form of national fundamental facility.