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The boundedness tests for the number of compact integral manifolds of autonomous ordi-nary differential systems, of autonomous total differential systems, of linear systems of partial differential eq...
A few years ago Selivanova gave an existence proof for some integrable models, in fact geodesic flows on two dimensional manifolds, with a cubic first integral. However the explicit form of these mod...
Domain characterizations on two taut manifolds are obtained by some local biholomorphism properties.
We establish several asymptotic formulae for Brillouin index on flat tori. As an application of these formulae it is proved that the topological entropy of a geodesic flow on a flat torus is zero.

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