In some contexts e.g. on Wikipedia it is defined as a matter of happening . In others(e.g. as defined by Einstein in his book "Relativity the special and general theory") it is defined as a matter of observation.
Both definitions are distinct from each other. In case of Wikipedia's thought experiment two events $A$ and B(reaching of light at the back and front of train) are declared not simultaneous without observing them.
acc. to the Einstein's definition events can be empirically dissimultaneous only if they are observed to be dissimultaneous. So A and B are not dissimultaneous as par the criteria imposed by Einstein.
Are A and B (as explained on Wikipedia's experiment) are dissimultaneous in platform's frame, if yes then explain how these will be observed dissimultaneously.
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