“…5). It is worth to note that, in the bibliography, the Relaxation Scheme is formulated along with the initial choice Φ 1 2 := ( 0 ) (see, e.g., [4,5,10,11]), which is a first order in time approximation of ( ( 1 2 , •)) and results a first order in time convergence of Φ + 1 2 to ( ( + 1 2 , •)) (see Thm. 4.7 and Tab.…”