An Introduction to Finsler Geometry


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Every Finsler manifold becomes an intrinsic quasimetric space when the distance between two points is defined as the infimum length of the curves that join them. The Finsler metric F is also required to be smooth , more precisely:.

Tamássy : Finsler geometry in the tangent bundle

Here the Hessian of F 2 at v is the symmetric bilinear form. If F is strongly convex, then it is a Minkowski norm on each tangent space. A reversible Finsler metric defines a norm in the usual sense on each tangent space. Let M , d be a quasimetric so that M is also a differentiable manifold and d is compatible with the differential structure of M in the following sense:.

The Finsler function F obtained in this way restricts to an asymmetric typically non-Minkowski norm on each tangent space of M.

An Introduction to Riemann-Finsler Geometry

In analogy with the Riemannian case, there is a version. From Wikipedia, the free encyclopedia. For a smooth function u on M , the gradient vector and the Finsler-Laplacian of u is defined by. In particular, on M u we have.

An introduction to Finsler geometry / Xiaohuan Mo.

Let M , F be a Finsler manifold. Define the distance function by. Lemma 2.

Then on M u we have. Theorem 3. Using 2. We refer to [ 14 ] for details. This yields. Combining 3. Proposition 3. Proposition 4. For two positive integrable functions f and g , if f g is monotone increasing, then the function. Theorem 4.

Since the Stokes formula still holds for Lipschitz continuous functions, we have. Combining this and 4.


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For example,. Moreover, the corresponding Laplacian comparison theorem still holds [ 6 ]. So the proof is omitted here. Corollary 4. It is well known that.

Remark 4. In [ 15 ], Milnor proved that the fundamental group of a compact Riemannian manifold of negative sectional curvature has exponential growth.

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Then this result was generalized to the case of negative Ricci curvature and nonpositive sectional curvature in [ 16 ] and [ 17 ]. The key point of the proof is to give a lower bound estimate for the volume of the geodesic balls of the universal covering space. In [ 3 ] and [ 4 ], the results were also generalized to the Finsler setting.

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Suppose that one of the following two conditions holds :. Theorem 5. Integrating both sides of 5. Pure Appl. Wu BY: Volume form and its applications in Finsler geometry. Ohta S: Finsler interpolation inequalities. Partial Differ. Ding Q: A new Laplacian comparison theorem and the estimate of eigenvalues. B , Abstract No. Yau ST: Some function-theoretic properties of complete Riemannian manifold and their applications to geometry. Indiana Univ.

1 Introduction

Xing H: The geometric meaning of Randers metrics with isotropic S -curvature. Acta Math. Milnor J: A note on curvature and fundamental group. Yang YH: On the growth of the fundamental groups on nonpositive curvature manifolds.

An Introduction to Finsler Geometry An Introduction to Finsler Geometry
An Introduction to Finsler Geometry An Introduction to Finsler Geometry
An Introduction to Finsler Geometry An Introduction to Finsler Geometry
An Introduction to Finsler Geometry An Introduction to Finsler Geometry
An Introduction to Finsler Geometry An Introduction to Finsler Geometry
An Introduction to Finsler Geometry An Introduction to Finsler Geometry
An Introduction to Finsler Geometry An Introduction to Finsler Geometry

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