Linear operator A is defined as [tex]A(C_1f(x)+C_2g(x))=C_1Af(x)+C_2Ag(x)[/tex] Question. Is A=5 a linear operator? I know that this is just number but it satisfy relation [tex]5(C_1f(x)+C_2g(x))=C_15f(x)+C_25g(x)[/tex] but it is also scalar. Is function ##A=x## linear operator? It also satisfy [tex]x(C_1f(x)+C_2g(x))=C_1xf(x)+C_2xg(x)[/tex] Thanks for the answer!