Duality for Interpolation Spaces Defined Via Slowly Varying Functions: The Case 0<q<1

Given $(A_0,A_1)$ a compatible couple of Banach spaces, we describe the dual of the limiting real interpolation space $(A_0,A_1{)}_{1,q,b}^K$ for $0<q<1$ and $b$ a slowly varying function. In the process, we use the $J$-spaces $(A_0,A_1{)}_{1,q,b}^J$ and we establish an equivalence theorem for $K$ and $J$ spaces of independent interest. We also give examples that recover known results on this topic.