If the Ax and Ay, some are positive and some are negative, this is the way by which we have learned we should combine multiples of i.
如果 Ax 和 Ay 有正有负,这就要用到我们所学过的方法,将所有 i 的倍数加起来
耶鲁公开课 - 基础物理课程节选
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