Alberto Cabada is Professor at the University of Santiago de Compostela (Spain). His line of research is devoted to the existence and multiplicity of solutions of nonlinear differential equations, both ordinary and partial, as well as difference and fractional ones. He is the author of more than one hundred forty research and has authored two monographs. Francisco Javier Fernández is Associate Professor at the University of Santiago de Compostela. He has participated in 8 national and regional research projects and is the author of 27 research publications. He has also participated in 27 national and international conferences. Francisco Javier Fernández has received 3 consecutive teaching merit awards, the last of these for the period of 2016-2021. Since the beginning of his academic career at the University of Santiago de Compostela, he has taught subjects related to measurement theory and Lebesgue integration.