Solvability of a Class of Nonlinear Fourth-Order Three-Point Boundary Value Problems

研究了一类四阶三点边值问题解与正解的存在性。利用一类三阶三点边值问题的Green函数，建立了等价的积分方程组，得到了该类四阶三点边值问题解和正解存在的充分条件。The existence of solutions and positive solutions for a class of fourth-order three-point boundary value problems is investigated in this paper. Employing the Green function of a third-order three-point boundary value problem, the equivalent integral equation system is established, and some sufficient conditions of existence of solutions and positive solutions are obtained for this class of fourth-order three point boundary value problems.