A minimum basis set is one in which, on each atom in the molecule, a single basis function is used for each orbital in a HartreeâFock calculation on the free atom. However, for atoms such as lithium, basis functions of p type are added to the basis functions corresponding to the 1s and 2s orbitals of the free atom. For example, each atom in the second period of the periodic system (Li-Ne) would have a basis set of five functions (two s functions and three p functions).
Microsoft first released Visual Studio (codenamed Boston, for the city of the same name, thus beginning the VS codenames related to places) in 1997, bundling many of its programming tools together for the first time.
For a number of years, Microsoft shipped individual development tools like Visual C++ and Visual Basic, but starting in 1997 they began offering Visual Studio, which combined all of these environments into one application. (The separate applications are still available for purchase, but are far less popular.)