一种相对论速度合成公式的简捷推导方法

A simple derivation of the relativistic addition law for parallel velocities

本文从光速不变原理直接出发，即可获得沿运动方向的狭义相对论速度合成公式．方法简捷。而且不需利用罗仑兹变换、长度缩短、时间变慢等。

The relativistic addition law for parallel velocities is derived as an immediate consequence of the constancy of the velocity of light, Without making use Lorentz transformations, and without appealing to the phenomena of length contraction, time dilation etc.