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We present new proofs of two results on the billiard ball problem by Rychlik R] and Bialy B]. x0. INTRODUCTION. We will give new proofs of two results on the billiard ball problem by Rychlik R] and Bialy B]. The original proofs were based on variational considerations. In our approach the variational context is absent, the dynamical system takes the center… (More)
Dogs latently infected with Babesia canis were systematically detected amongst a population kept in an enzootic area over a year. Detection of parasite was carried out on 43 healthy dogs and identified by two blood cultures in an interval of a few months. A serological study was performed using indirect immunofluorescence and Western blot. This study… (More)
In this paper we show that any surface in R3 can be modified by gluing on small ‘focusing caps’ so that its geodesic flow becomes ergodic. A new concept, finite horizon cap geometry, is what makes the construction work.