The important thing is not to stop questioning. Curiosity has its own reason for existing. One cannot help but be in awe when one contemplates the mysteries of eternity... Never lose a holy curiosity. Albert Einstein. 相对论的世界 The World of Relativities. 第 12 讲. 第 12 讲 相对论的世界. 相对论前史.
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索罗文 Maurice Solovine
We had a wonderful time in those days in Bern in our cheerful 'Academy,' which was less childish than those respectable ones which I later got to know only too well.
Lord William Thomson Kelvin, 1824~1907
v2. 与坐标系运动方向相垂直的运动的物体长度没有变化Nothing Happens To Lengths Transverse To A Boost