時空圖,又閔可夫斯基圖,示閔可夫斯基時空事之位也,一理解狹義相對論之器也。每質點均可時空圖連續曲線示之,遂曰之世界線。
此四維之坐標系:甲軸(x)、乙軸(y)、丙軸(z),曰空間軸;以時乘光速(ct)一軸(光時),曰時間軸。此每點均示一事。
直角坐標系質點均速,穿原點斜率之直線也。若簡諧運動質點正弦曲線也。
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