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Ivancevic_Applied-Diff-Geom

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Chapter 5<strong>Applied</strong> Jet <strong>Geom</strong>etryModern formulation of generalized Lagrangian and Hamiltonian dynamicson fibre bundles is developed in the language of jet spaces, or jetmanifolds (see [Kolar et al. (1993); Saunders (1989); Griffiths (1983);Bryant et. al. (1991); Bryant et al. (2003); Giachetta et. al. (1997);Mangiarotti et. al. (1999); Mangiarotti and Sardanashvily (2000a); Saunders(1989); Sardanashvily (1993); Sardanashvily (1995); Sardanashvily(2002a)]).Roughly speaking, given two smooth manifolds M and N, the twosmooth maps f, g : M → N between them are said to determine the samek−jet at a point x ∈ M, if they have the kth order contact (or, the kth ordertangency) at x [Kolar et al. (1993); Arnold (1988a)]. A set of all k−jetsfrom M to N is a jet space J k (M, N). It is a generalization of a tangentbundle that makes a new smooth fiber bundle out of a given smooth fiberbundle – following the recursive n−categorical process. It makes it possibleto write differential equations on sections of a fiber bundle in an invariantform. Historically, jet spaces are attributed to C. Ehresmann, and were anadvance on the method of prolongation of E. Cartan, of dealing geometricallywith higher derivatives, by imposing differential form conditions onnewly–introduced formal variables.5.1 Intuition Behind a Jet SpaceThe concept of jet space is based on the idea of higher–order tangency, orhigher–order contact, at some designated point on a smooth manifold (see[Arnold (1988a); Kolar et al. (1993)]). Namely, a pair of smooth manifold797

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