⁴⁴The stability of systems follows from $A(\mathit{𝑗𝜔})\beta (\mathit{𝑗𝜔})$. With zero feedback $\beta =0$ and the –1 point cannot be encircled by a $\mathit{𝐴𝛽}(\mathit{𝑗𝜔})$-contour. In other words: if there is feedback there is nothing that can yield unstable behavior. This is a convenient characteristic of any feedforward system: they are unconditionally stable; something which we cetainly cannot say about feedback systems. Well, we could, but it would be incorrect.