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Let be a -dimensional foliation on an -manifold , and the -tangent bundle of . The purpose of this paper is to present some reltionship between the foliation and a natural lifting of to the bundle . Let
The author studies the problem how a map on an -dimensional manifold can induce canonically a map for a fixed natural number. He proves the following result: “Let be a natural operator for -manifolds. If then there exists a uniquely determined smooth map such that .”The conclusion is that all natural functions on for -manifolds are of the form , where is a function of variables.
The author proves that for a manifold of dimension greater than 2 the sets of all natural operators and , respectively, are free finitely generated -modules. The space , this is, jets with target 0 of maps from to , is called the space of all -covelocities on . Examples of such operators are shown and the bases of the modules are explicitly constructed. The definitions and methods are those of the book of I. Kolář, P. W. Michor and J. Slovák [Natural operations in differential geometry,...
In this nice paper the author proves that all natural symplectic forms on the tangent bundle of a pseudo-Riemannian manifold are pull-backs of the canonical symplectic form on the cotangent bundle with respect to some diffeomorphisms which are naturally induced by the metric.
[For the entire collection see Zbl 0699.00032.] Natural transformations of the Weil functor of A-velocities [I. Kolař, Commentat. Math. Univ. Carol. 27, 723-729 (1986; Zbl 0603.58001)] into an arbitrary bundle functor F are characterized. In the case where F is a linear bundle functor, the author deduces that the dimension of the vector space of all natural transformations of into F is finite and is less than or equal to . The spaces of all natural transformations of Weil functors into linear...
This survey paper presents lecture notes from a series of four lectures addressed to a wide audience and it offers an introduction to several topics in conformal differential geometry. In particular, a very nice and gentle introduction to the conformal Riemannian structures themselves, flat or curved, is presented in the beginning. Then the behavior of the covariant derivatives under the rescaling of the metrics is described. This leads to Penrose’s local twistor transport which is introduced in...
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