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dropped |R

A verified theory for rational numbers representation and simple calculations;
verified with respect to the real numbers;

Fixed bug that caused proof of induction theorem to fail if
introduction rules contained True or False.

minimize imports

clean up polar_Ex proofs; remove unnecessary lemmas

remove simp attribute from various polar_Ex lemmas

tuned proofs

spelling: rename arcos -> arccos

tuned proofs

add lemma sgn_mult; declare real_scaleR_def and scaleR_eq_0_iff as simp rules