Let \(X,Y\) be normed spaces . A bounded operator \(T\colon X\to Y\) is called isomorphism between from \(X\) onto \(Y\) if it is bijective and the inverse \(T^{-1}\) is bounded.
Let \(X,Y\) be normed spaces . A bounded operator \(T\colon X\to Y\) is called isomorphism between from \(X\) onto \(Y\) if it is bijective and the inverse \(T^{-1}\) is bounded.