Terms containing problem class

Subject	English	Russian
math.	problem class	класс задач (there are a number of techniques for extending this problem class at the expense of an increase in computing cost)
math.	there are a number of techniques for extending this problem class at the expense of an increase in computing cost	расширение класса (задач)
math.	there are a number of techniques for extending this problem class at the expense of an increase in computing cost	вычислительные затраты