((min_f)E(f)=(min_f)(∑_(a=1)^K)((\[LeftDoubleBracketingBar](Subscript[y, a])-f((Subscript[v, a]))\[RightDoubleBracketingBar])^2)+λ T((\[LeftDoubleBracketingBar]Lf\[RightDoubleBracketingBar])^2)(9))