Abstract
Professor Biagio Ricceri recently sent us a counterexample to a result in our paper [1]. After a revision of the paper, we have detected a non-correct use of Sard-Smale theorem in the proof of Section (aI-2-2) of Theorem 7. This leads us to add hypothesis (iv) to this theorem. In the particular case in which the operator B is linear, the hypothesis (iv) coincides with (iii) and it is non superfluous.
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