roothaan proposed representing the hartree fock orbitals as linear combinations of a complete set of known functions called basis function . 羅湯建議把哈特利福克軌道表示成已知函數稱基函數。
object can be used across function calls and threads 可以跨函數調用和線程使用
function call is an empty node set, which the 函數調用的結果是一個空節點集,
object, or some custom object that lets the function call 對象還是一些讓該函數調用
executes a late-bound method or function call 執行后期綁定方法或函數調用。