Positive solutions for a system of Hadamard fractional $({\varrho }_1,{\varrho }_2,{\varrho }_3)$-Laplacian operator with a parameter in the boundary

In this paper, we are gratified to explore existence of positive solutions for a tripled nonlinear Hadamard fractional differential system with $({\varrho }_1,{\varrho }_2,{\varrho }_3)$-Laplacian operator in terms of the parameter $({\sigma }_1,{\sigma }_2,{\sigma }_3)$ are obtained, by applying Avery-Henderson and Leggett-Williams fixed point theorems. As an application, an example is given to illustrate the effectiveness of the main result.