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The purpose of this Note is to show that global geometry requires Lie groupoid theory. In this way we show that holonomy groupoid of a regular foliation leads to a satisfactory solution of many global existence problems. Three examples are given: Palais'theorem on local group actions, a characteristics method and links between Lie groupoid and algebroid morphisms. Complete proofs will be given elsewere.  相似文献   

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The aim of this work is to introduce and analyse the new algorithms for solving the transport equation in two-dimensional plane geometry. These schemes are based on a splitting method for the collision operator, introduced in [1]–[3]. Theoretical and numerical results are given and prove the superiority of these schemes over classical algorithms.  相似文献   

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