Systems-disconjugacy of a fourth-order differential equations
Systems-disconjugacy of a fourth-order differential equations
where r(x) >0 and p(x) are both continuous on [a, oo) and p(x) does not change sign, and related conjugate point properties to oscillation. They gave extensive evidence indicating that the oscillatory behavior when p(x) is positive is essentially different from that when p(x) is negative. Relatively little is known …