Adams type inequalities and related elliptic partial differential equations in dimension four

Motivated by Ruf–Saniʼs recent work, we prove an Adams type inequality and a singular Adams type inequality in the whole four-dimensional Euclidean space. As applications of those inequalities, a class of elliptic partial differential equations are considered. Existence of nontrivial weak solutions and multiplicity results are obtained via the mountain-pass theorem and the Ekelandʼs variational principle. This is a continuation of our previous work about singular Trudinger–Moser type inequality.