Lens space index and global properties for 4d N=2 models

The additional data necessary to univocally fix the gauge group for a given algebra are represented by the same charge lattices of mutually local Wilson and 't Hooft lines for both 4d N = 4 SYM and N = 2 elliptic models. Motivated by this equivalence in this paper we study the Lens space index of these N = 2 elliptic models. The index is indeed sensitive to the global properties and in the N = 4 case it is expected to coincide among S-dual models with different global properties, while it gives different results for models that lie in other S-duality orbits. Here by an explicit calculation we show that the same results hold for the N = 2 elliptic models as well.