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Quote by mananvpanchal
Other thing I want to point out is in wiki
 Quote by wiki In an inertial reference frame S', $x'_1$ and $x'_2$ shall denote the endpoints for an object of length $L'_0$ at rest in this system.
So, $L'_0$ at rest in S', and so $L'_0$ is proper length in S', and so we should have $t'_1=t'_2$.
Where in the Wiki article does it say that t'1 = t'2?