... 1=2, and c2 m1=2, where m1 is defined in (9). Condition (13) is: m1kF ðu0Þk 6 R. If this inequality holds, then the conclusions of Example 1 hold. In Example 6 we have obtained some results from =-=[14]-=-. Our approach is more general than the one in [14], since the choices of f and h do not allow one, for example, to obtain U used in Example 5. 3. Linear ill-posed problems We assume that (9) fails. C...