proposition: Fact lb_nat_fix_3 x l : ⟦x::l⟧ = bool2nat x+2*⟦l⟧.
proof: Proof. trivial. Qed.
imports: Arith Nat Lia List Bool Setoid Undecidability.Shared.Libs.DLW.Utils(utils_tac utils_list utils_nat bool_list gcd sums power_decomp)