By Shoshichi Kobayashi

ISBN-10: 3540586598

ISBN-13: 9783540586593

ISBN-10: 3642619819

ISBN-13: 9783642619816

Given a mathematical constitution, one of many uncomplicated linked mathematical gadgets is its automorphism workforce. the item of this e-book is to provide a biased account of automorphism teams of differential geometric struc tures. All geometric constructions usually are not created equivalent; a few are creations of ~ods whereas others are items of lesser human minds. among the previous, Riemannian and intricate constructions stand out for his or her attractiveness and wealth. an immense component to this booklet is for this reason dedicated to those buildings. bankruptcy I describes a common concept of automorphisms of geometric constructions with emphasis at the query of while the automorphism workforce may be given a Lie team constitution. easy theorems during this regard are offered in §§ three, four and five. the idea that of G-structure or that of pseudo-group constitution permits us to regard many of the fascinating geo metric constructions in a unified demeanour. In § eight, we cartoon the connection among the 2 ideas. bankruptcy I is so prepared that the reader who's basically drawn to Riemannian, complicated, conformal and projective buildings can bypass §§ five, 6, 7 and eight. This bankruptcy is partially in response to lec tures I gave in Tokyo and Berkeley in 1965.

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The Lie algebra) of transformations f (resp. infinitesimal transformations X) such that f* Jl = Jl (resp. Lx Jl =0). )(M) with Lie algebra a(M, Jl) (Omori [2], Ebin-Marsden [1]). )c(M) of Jl-preserving transformations with compact support with the corresponding Lie algebra ac(M,Jl)=a(M,Jl)n XAM). The following result is due to Boothby [3]. 1. Given a volume element Jl on a manifold M of dimension n~2, the group mc(M,Jl) of Jl-preserving transformations with compact support (in fact, already the subgroup generated by ac(M, Jl)) is k-fold transitive on M for every positive integer k.

If x and y are arbitrary points of M, we join them by a finite number of geodesic segments and apply the construction above to each segment. In this way, we see that there is an element of (fj which sends x into y. Since (fj is transitive on M, we have r=dim 6)=dim M +dim (fjx=n +dim O(n)=tn(n+ 1). d. 2 is due to H. C. Wang [1]. 2, it is natural to ask which Riemannian manifolds of dimension n admits a group of isometries of dimension tn(n-l)+ 1. Let M be an n-dimensional Riemannian manifold with n =1= 4.

But the kernel of 0 is precisely 91. ) The k-th prolongation 1l, of P is defined inductively by 1l, = (1l,-1)1 = the first prolongation of 1l,-1; it is a Gk-structure over 1l,-1. Let qJ be an automorphism of a G-structure P over M; it is a transformation of M such that the induced bundle automorphism qJ* of L(M) leaves P mvariant. We denote the restriction of qJ* to P by qJ1· Then qJ1 is an automorphism of the G1 -structure ~ over P. To see this, let H be a horizontal subspace of ~(P) such that c(u, H)E C so that the corresponding linear frame z of P at u is in ~.

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