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The liouville-green asymptotic theory for second-order differential equations: A new approach and s有机体 发表于 2025-3-23 15:25:13
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A concept of adjointness and symmetry of differential expressions based on the generalised Lagrange唤起 发表于 2025-3-23 22:50:38
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Matrix riccati inequality and oscillation of second order differential systems,