A priori bounds for elliptic and parabolic problems (equations and inequalities)
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Comparison principles and multiple solutions for nonlinear elliptic problems
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Isotropic and anisotropic double phase problems
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Fucik spectrum of elliptic operators
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Gradient dependence on the right-hand side (convection term)
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Morse theory and critical groups
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Nonhomogeneous operators
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Nonlinear elliptic and parabolic differential equations and inclusion
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Nonsmooth variational problems (variational- and hemivariational inequalities)
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Singular problems
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