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Si definisce un esponente di Floquet per certe equazioni differenziali lineari nonperiodiche, la parte immaginaria del quale rappresenta una «rotazione» delle soluzioni di dette equazioni. Inoltre si discute la relazione fra l'esponente di Floquet e le funzioni m di Weyl-Kodaira, e fra la rotazione e certi problemi spettrali.
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The author would like to thank Dr. RichardCushman for stimulating conversations on the subjects considered in this paper.
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Johnson, R.A. m-functions and Floquet exponents for linear differential systems. Annali di Matematica pura ed applicata 147, 211–248 (1987). https://doi.org/10.1007/BF01762419
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DOI: https://doi.org/10.1007/BF01762419