• positive solutions of fourth order problems with clamped beam boundary conditions

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 380
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
    in this paper we make an exhaustive study of the fourth order linear operator u(4) + m u coupled with the clamped beam conditions u(0) = u(1) = u′(0) = u′(1) = 0. we obtain the exact values on the real parameterm for which this operator satisfies an anti-maximum principle. such a property is equivalent to the fact that the related green’s function is nonnegative in [0, 1] × [0, 1]. when m < 0 we obtain the best estimate by means of the spectral theory and for m > 0 we attain the optimal value by studying the oscillation properties of the solutions of the homogeneous equation u(4) + m u = 0. by using the method of lower and upper solutions we deduce the existence of solutions for nonlinear problems coupled with this boundary conditions.

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