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列车上xA = ctA
地面上xB = ctB。
如果我们仍然坚持时间是绝对的tA = tB由上面的两个式子就必然有xA = xB这个结果意味着无论是在列车上的人、还是在地面上的人所看到光走过的路线应当是一样的。但是这样的结果与事实不符因此如果认可“光速是绝对的”这个假说就必须扬弃“时间是绝对的”这个假说进而认为时间是相对的在不同的惯性系中的时间度量是不同的速度越快的惯性系时间流逝越慢。在这个假说下在列车上时间的流逝要