摘要

We study a system of second-order dynamic equations on time scales (P(1)u(1)(del))(Delta) (t) - q(1)(t)u(1)(t) + lambda f(1)(t,u(1)(t), u(2)(t)) = 0,t is an element of (t(1),t(n)), (P(2)u(2)(del))(Delta) (t) - q(2)(t)u(2)(t) + lambda f(2)(t,u(2)(t), u(2)(t)) = 0, satisfying four kinds of differentmultipoint boundary value conditions, f(i) is continuous and semipositone. We derive an interval of lambda such that any lambda lying in this interval, the semipositone coupled boundary value problem has multiple positive solutions. The arguments are based upon fixed-point theorems in a cone.

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