Positive Solutions Of Some Boundary Value Problems For Two-order Difference Equations

In this paper we study existence of positive solutions for thefollowing three kinds of multi-point boundary value problems by usingthe fixed point theorem in cone.U" + a(t)f(u) 0,t E (0,1)1.(1)u(O) = /3u(q),u(1) au(q)where a>0.fl>0.00,00 is parameter , a>O, O