Soriano, J. M. http://orcid.org/0000-0002-4456-1972
Cabrera, M. OrdoƱez
Funding for this research was provided by:
Plan Andaluz de investigaciĆ³n de la Junta de Andalucia (FQM-127)
Meck (MTM2012-34847-C02-01)
Article History
Received: 5 July 2017
Accepted: 9 January 2018
First Online: 18 January 2018
Change Date: 23 June 2018
Change Type: Correction
Change Details: 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.