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Differential Geometry of Spray and Finsler Spaces (Hardcover, 2001 ed.)
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Differential Geometry of Spray and Finsler Spaces (Hardcover, 2001 ed.)
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In this book we study sprays and Finsler metrics. Roughly speaking,
a spray on a manifold consists of compatible systems of
second-order ordinary differential equations. A Finsler metric on a
manifold is a family of norms in tangent spaces, which vary
smoothly with the base point. Every Finsler metric determines a
spray by its systems of geodesic equations. Thus, Finsler spaces
can be viewed as special spray spaces. On the other hand, every
Finsler metric defines a distance function by the length of
minimial curves. Thus Finsler spaces can be viewed as regular
metric spaces. Riemannian spaces are special regular metric spaces.
In 1854, B. Riemann introduced the Riemann curvature for Riemannian
spaces in his ground-breaking Habilitationsvortrag. Thereafter the
geometry of these special regular metric spaces is named after him.
Riemann also mentioned general regular metric spaces, but he
thought that there were nothing new in the general case. In fact,
it is technically much more difficult to deal with general regular
metric spaces. For more than half century, there had been no
essential progress in this direction until P. Finsler did his
pioneering work in 1918. Finsler studied the variational problems
of curves and surfaces in general regular metric spaces. Some
difficult problems were solved by him. Since then, such regular
metric spaces are called Finsler spaces. Finsler, however, did not
go any further to introduce curvatures for regular metric spaces.
He switched his research direction to set theory shortly after his
graduation.
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