Terms for subject Mathematics containing pencil-of-function

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
pencil of analytic functions	пучок аналитических функций
pencil of regular functions	пучок регулярных функций