On the stabiltiy of a system of functional equations characterizing generalize hyperbolic and trigonometric functions.
Jens Schwaiger, Wolfgang Förg-Rob (1993)
Aequationes mathematicae
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Jens Schwaiger, Wolfgang Förg-Rob (1993)
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István Fenyö (1987)
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Walter Benz (1980)
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Walter Benz (1981)
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László Simon (2014)
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We consider second order semilinear hyperbolic functional differential equations where the lower order terms contain functional dependence on the unknown function. Existence and uniqueness of solutions for t ∈ (0,T), existence for t ∈ (0,∞) and some qualitative properties of the solutions in (0,∞) are shown.
R. Kellerhals (1995)
Geometric and functional analysis
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Grigolia, M. (1999)
Memoirs on Differential Equations and Mathematical Physics
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Michał Kisielewicz (1975)
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Avalishvili, G., Gordeziani, D. (1999)
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J. Kisyński (1970)
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