Abstract :
By the quadrature method, we show that if there exists α ≤ 2 such that
View the MathML sourcelims→+∞supf(s)s(lns)α=L∈[0,∞),
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then, the problem mml has no solution in C2(0,1), for any λ > 0; and if there exists a > 2 such that lims→+∞ inf(f (s)/s(ln s)α) = L E (0, ∞], then, the problem has a solution u ∈ C2(0, 1) for some λ > 0.