  In 2016 Aussel, Sultana and Vetrivel developed the concept of projected
solution for quasi-variational inequality problems and projected Nash
equilibrium. We introduce a new concept of solution for quasi-equilibrium
problems and we study the existence of such solutions. Additionally, as a
consequence of our results, we give existence results of projected solutions
for quasi-optimization problems, quasi-variational inequalities problems and
generalized Nash equilibrium problems.
