Andr\'eka's conjecture is proven: no intermediate model of spacetime exists strictly between special relativity and late classical kinematics on R^4.
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On Andr\'eka's Conjecture that special relativity is the only possible conceptual reduct of classical kinematics
Andr\'eka's conjecture is proven: no intermediate model of spacetime exists strictly between special relativity and late classical kinematics on R^4.