Schrödinger had proved/predicted QE theoretically prior to experimental (though not loop-hole free) verification. the theory also firmly predicted that QE could not be used to send instantaneous signals. the theoretical understanding/prediction of QE was there prior to experimental observation (?) Question- What knowledge/logic was used to prove/predict QE theoretically? - explain in layman's terms/language i.e. what body of QM knowledge, rudimentary observations were known prior to bell's tests?