Abstract
We give definitions of generalized lower and upper functions and generalized solution, which differs from a solution in the conventional sense in that the derivative of a generalized solution can be equal to +∞ and −∞. We show how to use generalized solutions for obtaining classical results.
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Lepin, L.A., Generalized Solutions and the Solvability of Boundary Value Problems for a Second-Order Differential Equation, Differ. Uravn., 1982, vol. 18, no. 8, pp. 1323–1330.
Lepin, A.Ya. and Lepin, L.A., Kraevye zadachi dlya obyknovennogo differentsial’nogo uravneniya vtorogo poryadka (Boundary Value Problems for a Second-Order Ordinary Differential Equation), Riga: Zinatne, 1988.
Crandall, M.G. and Lions, P.-L., Viscosity Solutions of Hamilton-Jacobi Equations, Trans. Amer. Math. Soc., 1983, vol. 277, no. 1, pp. 1–42.
De Coster, C., Pairs of Positive Solutions for the One-Dimensional φ-Laplacian, Nonlinear Anal., 1994, vol. 23, no. 5, pp. 669–681.
Cabada, A. and Pouso, R.L., Existence Result for the Problem (g4(u′))′ = f(t, u, u′) with Periodic and Neumann Boundary Conditions, Nonlinear Anal., 1997, vol. 30, no. 3, pp. 1733–1742.
Wang, J. and Gao, W., Existence of Solutions to Boundary Value Problems for a Nonlinear Second Order Equation with Weak Carathéodory Functions, Differential Equations Dynam. Systems, 1997, vol. 5, no. 2, p. 175.
Cabada, A. and Pouso, R.L., Existence Results for the Problem (φ(u′))′ = f(t, u, u′) with Nonlinear Boundary Conditions, Nonlinear Anal., 1999, vol. 35, no. 2, pp. 221–231.
Cherpion, M., De Coster, C., and Habets, P., Monotone Iterative Methods for Boundary Value Problems, Differential Integral Equations, 1999, vol. 12, no. 3, pp. 309–338.
Cabada, A. and Pouso, R.L., Extremal Solutions of Strongly Nonlinear Discontinuous Second-Order Equations with Nonlinear Functional Boundary Conditions, Nonlinear Anal., 2000, vol. 42, no. 8, pp. 1377–1396.
Cabada, A. and Pouso, R.L., Existence Theory for Functional φ-Laplacian Equations with Variable Exponents, Nonlinear Anal., 2003, vol. 52, pp. 557–572.
Lepin, A.Ya., Lepin, L.A., and Sadyrbaev, F.Ž., Two-Point Boundary Value Problems with Monotone Boundary Conditions for One-Dimensional φ-Laplacian Equations, Funct. Differ. Equ., 2005, vol. 12, no. 3–4, pp. 347–363.
Jin, C., Yin, J., and Wang, Z., Positive Radial Solutions of φ-Laplacian Equations with Sign Changing Nonlinear Sources, Math. Methods Appl. Sci., 2007, vol. 30, pp. 1–14.
Cabada, A., O’Regan, D., and Pouso, R.L., Second Order Problems with Functional Conditions Including Sturm-Liouville and Multipoint Conditions, Math. Nachr., 2008, vol. 281, no. 9, pp. 1254–1263.
Hu, S. and Papageorgiou, N.S., Multiple Positive Solutions for Nonlinear Eigenvalue Problems with the φ-Laplacian, Nonlinear Anal., 2008, vol. 69, pp. 4286–4300.
Chen, C. and Wang, H., Ground State Solutions for Singular φ-Laplacian Equation in R N, J. Math. Anal. Appl., 2009, vol. 351, pp. 773–780.
Rachunková, I. and Tomeček, J., Singular Nonlinear Problem for Ordinary Differential Equation of the Second-Order on the Half-Line, in AIP Conf. Proc., 2009, pp. 294–303
Minhós, F., Location Results: an under Used Tool in Higher Order Boundary Value Problems, in AIP Conf. Proc., 2009, pp. 244–253.
Lepin, A., Lepin, L., and Sadyrbaev, F., The Upper and Lower Functions Method for One-Dimensional φ-Laplacians, Nauchn. Tr. Inst. Mat. i Inform. Lat. Univ., 2009–2010, vol. 9–10, pp. 85–103.
Schrader, K.W., Existence Theorems for Second Order Boundary Value Problems, J. Differential Equations, 1969, vol. 5, no. 3, pp. 572–584.
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Original Russian Text © A.Ya. Lepin, L.A. Lepin, 2014, published in Differentsial’nye Uravneniya, 2014, Vol. 50, No. 5, pp. 601–610.
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Lepin, A.Y., Lepin, L.A. Generalized lower and upper functions for the φ-Laplacian. Diff Equat 50, 598–607 (2014). https://doi.org/10.1134/S0012266114050036
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DOI: https://doi.org/10.1134/S0012266114050036