... = −bu 2 , (11)u 2 being found from the problem∆v 2 − av 2 = finΩ,∂v 2 ∂ν= g1onΓ, ( 12) ∆u 2 = v 2 inΩ, u 2 = g0onΓ. (13)Proof. First we notice that the functionsu 2 andv 2 are ... of Math. 22 (1 & 2) (1994) 114— 120 .[7] Dang Quang A, Mixed boundary-domain operator in approximate solution of biharmonictype equation, Vietnam Journal of Math. 26 (1998) 24 3 25 2.[8] Dang ... Cybernetics, Vol .22 , No.3 (20 06), 22 9 23 4ITERATIVE METHOD FOR SOLVING A BOUNDARYVALUE PROBLEM FOR BIHARMONIC TYPE EQUATION*DANG QUANG A1, LE TUNG SON 2 1Institute of Information Technology 2 Thai...