Russian with German summary.)(•) In LG, only analytic manifolds were considered.The definitions can be slightly modified in order to allow us to treat the case of manifolds of class Ck(k ä 1).These modifications are trivial except as regards the definition of tangent vectors.This definition should be formulated as follows in the case of manifolds M of class C*.Let m be any point of M and let A be the class
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Chevalley et al. (1948) studied this question.