Terms containing second order difference

Subject	English	Russian
math.	difference of second order	разность второго порядка
IT	second order difference	разность второго порядка
math.	second order difference	вторая разность
math.	second-order difference	вторая разность
math.	when the error goes to zero as fast as h2, we say that the difference formulas are second order accurate	порядка точности