If she's got a pair of numbers and you got a pair of numbers, the new numbers are called the primed numbers and you want to write them in terms of yours.

如果她有一组系数 你也有一组系数,新的系数被称作带撇的系数,你想用自己的形式来表示它们

耶鲁公开课 - 基础物理课程节选