⁵¹The stability of systems follows from $A(\mathit{j\omega })\beta (\mathit{j\omega })$. With zero feedback $\beta =0$ and the –1 point cannot be encircled by a $\mathit{A\beta }(\mathit{j\omega })$-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.