The boundedness and compactness of a product-type operator, recently introduced by S. Stević, A. Sharma and R. Krishan, T ψ 1 , ψ 2 ,φ n f( z )= ψ 1 ( z ) f ( n ) ( φ( z ) )+ ψ 1 ( z ) f ( n+1 ) ( φ( ...