Generalized Campana points and adelic approximation on toric varieties

We introduce a general framework for studying special subsets of rational points on an algebraic variety, termed M-points. The notion of M-points generalizes the concepts of integral points, Campana points and Darmon points. We introduce and study M-approximation over number fields and function fields, which is a notion that generalizes weak and strong approximation. We show that this property implies that the set of M-points is not thin. We then give a simple characterisation of when a split toric varieties satisfy M-approximation, generalizing work of Nakahara and Streeter. Further, we determine when the set of M-points on a split toric variety is thin.