C. Y. Chan, "Sturmian theorems for systems of differential equations", International Journal of Mathematics and Mathematical Sciences, vol. 3, Article ID 587639, 8 pages, 1980. https://doi.org/10.1155/S0161171280000117
Sturmian theorems for systems of differential equations
Two Sturmian theorems are established for second order linear nonhomogeneous systems of two differential equations with the use of a maximum principle. The results also hold for homogeneous systems. For illustration, an example is given.
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