Using the theory of fixed point index, the existence of positive solutions for the singular senond?order boundary value problems is presented, where f(t, u, z) may change sign and may be singular at u=0 but not z=0.
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陈云,张黎黎,闫宝强. 具有可变号且与py′有关的非线性项的奇异边值问题的正解[J]. 科学技术与工程, 2006, (22): . CHEN Yun, ZHANG Lili, YAN Baoqiang.[J]. Science Technology and Engineering,2006,(22).
