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DEMONSTRATIO MATHEMATICANO IimVOL V I IKrzysztof TatarkiewiczCOMPORTEMENT ASYMPTOTIQUE DES SOLUTIONS DES EQUATIONSDIFFÉRENTIELLES LINEAIRES APPARTENANT AUX CAS-LIMITES1. Introduction. Soit l'équation l i n é a i r e(1.1)x" - 2 a ( t ) x '- b(t)x = 0(où a ( t ) et b i t ) , sont deux fonctions définies dans <0,+ <χ>) ) .Nous avons démontré ( v o i r [ 6 ] ) , que s ' i l existe deux constantes positives r , s t e l l e s que(1.2)b ( t ) > 2ra(t) + r 2 + sl'équation (1.1) admet des solutions non banales qui tendentexponnentiellement vers zéro. S ' i l existe deux constantes pos i t i v e s r , s t e l l e s que(1.5)b(t) »-2ra(t) + r 2 + sl'équation (1.1) admet des solutions qui ne sont pas r-bornées. On peut se demander quelle est la structure de la solution générale de l'équation (1.1) quand la condition (1.2)est v é r i f i é e , mais la condition (1.3) ne l ' e s t pas. Vu l eThéorème Ν du t r a v a i l [
Demonstratio Mathematica – de Gruyter
Published: Oct 1, 1974
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