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Ravi P. AGARWAL Donal O＇REGAN Svatoslav STANEK 《数学学报(英文版)》2006,22(3):827-832
A new upper and lower solution theory is presented for the second order problem （G＇（y））＇＋ f（t, y） = 0 on finite and infinite intervals. The theory on finite intervals is based on a Leray-Schauder alternative, where as the theory on infinite intervals is based on results on the finite interval and a diagonalization process. 相似文献
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