The linear positive torsor presentation and arithmetic purity of strong approximation

Abstract: In this article, we define a notion for varieties called linear positive torsor presentation. For varieties with a linear positive torsor presentation over number fields, we establish the arithmetic purity of strong approximation with the Brauer--Manin obstruction off the empty set. As a consequence, we recover arithmetic purity for smooth toric variety with no non-constant global section. Moreover, we classify the chain connected class for rational points on such varieties over any field of characteristic zero.