I did not agree to any universal meaning independent of frames, I proved when M and C' are co-located, both frames agree on the time of their respective frames. This is simple SR. Are you saying this is false? Further I never said Q=R is required under SR, since it is not.
Now, you again ran in terror from my post. The only reason you would do this is because you know you are totally wrong. Are you terrified to answer these questions? Do not forget, you pretend to be an expert to all those reading this thread.
They will understand by your fear you have no idea what you are doing.
Here it is again. Try to keep in mind all conclusions and calculations are based on M and C' being co-located.
When C' and M are co-located, event Q is valid for the frame Σ. (This assumes LP is correct)
When C' and M are co-located, event R is valid for the frame Σ'. (This assumes LP is correct)
When C' and M are co-located, event LT(Q) is valid for the frame Σ'. (This assumes LT correctly translates)
When C' and M are co-located, event LT(R) is valid for the frame Σ. (This assumes LT correctly translates)
However, LT(Q) != R and LT(R) != Q. (This show LP and LT do not agree when M and C' are co-located)
Hence, if C' and M are co-located, Q is valid for the frame Σ and so is LT(R).
Hence, if C' and M are co-located, R is valid for the frame Σ' and so is LT(Q).
Therefore, SR claims when C' and M are co-located, the light flash is at Q and LT(R) with LT(R) != Q, so 2 different places.
Therefore, SR claims when C' and M are co-located, the light flash is at R and LT(Q) with LT(Q) != R, so 2 different places.
The only thing you've proofed in this thread is your complete ignorance of the subject matter.