Rp. Agarwal et Fh. Wong, EXISTENCE OF POSITIVE SOLUTIONS FOR NONPOSITIVE DIFFERENCE-EQUATIONS, Mathematical and computer modelling, 26(7), 1997, pp. 77-85
We shall provide conditions on nonpositive function f(i,u(1),...,u(n-1
)) so that the discrete boundary value problem [GRAPHICS] has at least
one positive solution. Then, we shall apply this result to establish
several existence theorems which guarantee the multiple positive solut
ions.