On some distributions involving general functions

In this note, two aspects in relation to distribution involving general functions are considered. Firstly, the distribution of the sum and also the ratio of two independent radom variables with densities including ∅2 (a1,.... an; S; λ1 x, .. , λn x) and ψ2 (p ; b1 ..., bn ; t1 u .... tn y) is dealt...