Terms for subject Mathematics containing special functions

English	Russian
many tables of values for special functions could be calculated at a time when pencil and paper were the only available орудия	единственно доступные инструменты
many tables of values for special functions could be calculated at a time when pencil and paper were the only available tools	единственно доступные инструменты
special class of combinational functions	специальный класс комбинационных функций (ssn)
special classes of combinational functions	специальные классы комбинационных функций (ssn)
special function	специальная функция
special functions	спецфункции