Natural Operations in Differential Geometry, PDF eBook

Natural Operations in Differential Geometry PDF

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The aim of this work is threefold: First it should be a monographical work on natural bundles and natural op- erators in differential geometry.

This is a field which every differential geometer has met several times, but which is not treated in detail in one place.

Let us explain a little, what we mean by naturality.

Exterior derivative commutes with the pullback of differential forms.

In the background of this statement are the following general concepts.

The vector bundle A kT* M is in fact the value of a functor, which associates a bundle over M to each manifold M and a vector bundle homomorphism over f to each local diffeomorphism f between manifolds of the same dimension.

This is a simple example of the concept of a natural bundle.

The fact that exterior derivative d transforms sections of A kT* M into sections of A k+1T* M for every manifold M can be expressed by saying that d is an operator from A kT* M into A k+1T* M.

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