Terms for subject Mathematics containing be in step

English	Russian
in the case of linear convergence, in each step the error is multiplied by an almost constant convergence factor whose absolute value is less than 1	множитель сходимости
it is not essential that the stages in a step rocket be of increasing size	было бы
the first step was taken in 1993	первый шаг в данном направлении был предпринят в 1993 г