RP Agarwal, D O'Regan,
PJY Wong… - Constant-Sign Solutions …, 2013 - Springer
In this chapter we shall consider the system of Fredholm integral equations\displaystyle & &
u_ i (t)= h_ i (t)+ ∫ _ 0^ T g_ i (t, s) f_ i (s, u_ 1 (s), u_ 2 (s), ⋯\,, u_ n (s)) ds,\& …