## Remarks on the Lorentz Transformation and One Question

This is a summary of the second part of Appendix A in Albert Einstein’s book . By second part, I mean the part immediately after the derivation of the Lorentz transformation. If there is no relative motion between the coordinate systems with respect to the $y$ and $z$ axis of $K$, then the $Y$ and $Z$ coordinates of the light in $K$ are equal to the coordinates of the light in $K’$, since there is no need to modify these coordinates: $Y’ = Y$ and $Z’ = Z$. Next, the […]

## The Lorentz Transformation

This is an attempt to clarify the brief derivation of the Lorentz transformation in Albert Einstein’s book . Suppose that the speed of light, $c$, is the same regardless of whether a coordinate system is or is not translating with a nonzero speed.Next consider two coordinates systems.The first is called $K$ and the second is called $K’$.The coordinates for $K$ are $x,y,z,t$ and the coordinates for $K’$ are $x’,y’,z’,t’$.Let $K’$ be translating with respect to $K$ with a speed of $v$.The direction of this translation of $K’$ is