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Hypothetical situation in which, for simplification, only some physical aspects are considered in order to further understand or reveal contradictions between the laws governing them.
4
votes
Symmetry in the Simultaneity of events in Special Relativity
To supplement the answer by @SolubleFish ,
it might be helpful to interpret "simultaneity" geometrically,
in terms of the tangent line to a circle ("the curve of constant square-interval").
In Euclide …
38
votes
Accepted
Why is the photon clock equivalent to all clocks?
Invoke the principle of relativity.
An inertial observer carries both a light clock and a mechanical wristwatch,
which agree when all are at rest.
If they don't agree when the inertial observer is mov …