proposition: Lemma comp_shiftK (x : R) (f : R -> T) : (f \o shift x) \o center x = f.
proof: Proof. by rewrite funeqE => y /=; rewrite addrNK. Qed.
imports: HB(structures) mathcomp(all_ssreflect ssralg ssrint ssrnum finmap matrix) mathcomp(rat interval zmodp vector fieldext falgebra) mathcomp(mathcomp_extra boolp classical_sets functions) mathcomp(cardinality set_interval Rstruct) ereal reals signed topology prodnormedzmodule