Geodesic
Rotation number like total characteristic of stability of Hill equation
Vestnik Samarskogo universiteta. Estestvennonaučnaâ seriâ, no. 2 (2009), pp. 26-32

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Hill equation is considered. After transition to polar coordinates differential equation on torus for polar corner, satisfying to Karateodori conditions is gained. We shall give basic results. Hill equation (with various multiplicators) is strongly stable (strongly unstable) then and only then, when the rotation number is nonintegral (integral) nonnegative number. Formula connecting the nonintegral rotation number with multiplicators of Hill equation is received.
Keywords: strong stability, differential equations on torus, the number of rotation, multiplicators. 
@article{VSGU_2009_2_a2,
     author = {A. A. Zhukova},
     title = {Rotation number like total characteristic of stability of {Hill} equation},
     journal = {Vestnik Samarskogo universiteta. Estestvennonau\v{c}na\^a seri\^a},
     pages = {26--32},
     publisher = {mathdoc},
     number = {2},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VSGU_2009_2_a2/}
}
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A. A. Zhukova. Rotation number like total characteristic of stability of Hill equation. Vestnik Samarskogo universiteta. Estestvennonaučnaâ seriâ, no. 2 (2009), pp. 26-32. http://geodesic.mathdoc.fr/item/VSGU_2009_2_a2/