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In the [[mathematics|mathematical]] study of [[metric spaces]], one can consider the [[arclength]] of paths in the space.  If two points are at a given distance from each other, it is natural to expect that one should be able to get from one point to another along a path whose arclength is equal to (or very close to) that distance.  The distance between two points of a metric space relative to the '''intrinsic metric''' is defined as the [[infimum]] of the length of all paths from one point to the other.  A metric space is a '''length metric space''' if the intrinsic metric agrees with the original metric of the space.


==Definitions==
Let <math>(M, d)\,</math> be a [[metric space]]. We define a new metric <math>d_I\,</math> on <math>M\,</math>, known as the '''induced intrinsic metric''', as follows:
<math>d_I(x,y)\,</math> is the [[infimum]] of the lengths of all paths from <math>x\,</math> to <math>y\,</math>.


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Here, a ''path'' from <math>x\,</math> to <math>y\,</math> is a [[continuous map]]
:<math>\gamma : [0,1] \rightarrow M</math>
with <math>\gamma(0) = x\,</math> and <math>\gamma(1) = y\,</math>. The ''length'' of such a path is defined as explained for [[rectifiable curve]]s. We set <math>d_I(x,y) =\infty</math>  if there is no path of finite length from <math>x\,</math> to <math>y\,</math>. If
:<math>d_I(x,y)=d(x,y)\, </math> 
 
for all points <math>x\,</math> and <math>y\,</math> in <math>M\,</math>, we say that <math>(M, d)\,</math> is a '''length space''' or a '''path metric space''' and the metric <math>d\,</math> is '''intrinsic'''.
 
We say that the metric <math>d\,</math> has '''approximate midpoints''' if for any <math>\varepsilon>0</math> and any pair of points  <math>x\,</math> and <math>y\,</math>  in <math>M\,</math> there exists <math>c\,</math> in <math>M\,</math> such that <math>d(x,c)\,</math> and <math>d(c,y)\,</math> are both smaller than
:<math>{d(x,y)}/{2} + \varepsilon</math>.
 
==Examples==
* [[Euclidean space]] '''R'''<sup>''n''</sup> with the ordinary Euclidean metric is a path metric space. '''R'''<sup>''n''</sup> - {0} is as well.
* The [[unit circle]] S<sup>1</sup> with the metric inherited from the Euclidean metric of '''R'''<sup>2</sup> (the '''chordal metric''') is not a path metric space. The induced intrinsic metric on S<sup>1</sup> measures distances as [[angle]]s in [[radian]]s, and the resulting length metric space is called the [[Riemannian circle]].  In two dimensions, the chordal metric on the [[sphere]] is not intrinsic, and the induced intrinsic metric is given by the [[great-circle distance]].
* Every [[Riemannian manifold]] can be turned into a path metric space by defining the distance of two points as the infimum of the lengths of continuously differentiable curves connecting the two points. (The Riemannian structure allows one to define the length of such curves.)  Analogously, other manifolds in which a length is defined included [[Finsler manifold]]s and [[sub-Riemannian manifold]]s.
* Any [[complete metric space|complete]] and [[convex metric space]] is a length metric space {{harv|Khamsi|Kirk|2001|loc=Theorem 2.16}}, a result of [[Karl Menger]]. The converse does not hold in general, however: there are length metric spaces which are not convex.
 
== Properties ==
*In general, we have ''d'' ≤ ''d<sub>l</sub>'' and the [[topological space|topology]] defined by ''d<sub>l</sub>'' is therefore always [[finer topology|finer]] than or equal to the one defined by ''d''.
*The space (''M'', ''d''<sub>''l''</sub>) is always a path metric space (with the caveat, as mentioned above, that ''d''<sub>''l''</sub> can be infinite).
*The metric of a length space has approximate midpoints. Conversely, every [[complete space|complete]] metric space with approximate midpoints is a length space.
*The [[Hopf–Rinow theorem]] states that if  a length space <math>(M,d)</math> is [[complete space|complete]] and [[locally compact]] then any two points in <math>M</math> can be connected by a [[geodesic|minimizing geodesic]] and all bounded [[closed set]]s in <math>M</math> are [[compact set|compact]].
 
==References==
* {{citation|authorlink=Mikhail Gromov (mathematician)|first=Mikhail|last=Gromov|title=[[Metric Structures for Riemannian and Non-Riemannian Spaces]]|series=Progress in Math.|volume=152|publisher=Birkhäuser|year=1999|isbn=0-8176-3898-9}}
*{{citation
| authorlink1 = Mohamed Amine Khamsi
| last1      = Khamsi
| first1      = Mohamed A.  
| authorlink2 = William Arthur Kirk
| last2      = Kirk
| first2    = William A.
| title      = An Introduction to Metric Spaces and Fixed Point Theory
| publisher  = Wiley-IEEE
| date      = 2001
| pages      =
| isbn      = 0-471-41825-0
}}
 
[[Category:Metric geometry]]

Revision as of 08:36, 11 December 2013

In the mathematical study of metric spaces, one can consider the arclength of paths in the space. If two points are at a given distance from each other, it is natural to expect that one should be able to get from one point to another along a path whose arclength is equal to (or very close to) that distance. The distance between two points of a metric space relative to the intrinsic metric is defined as the infimum of the length of all paths from one point to the other. A metric space is a length metric space if the intrinsic metric agrees with the original metric of the space.

Definitions

Let be a metric space. We define a new metric on , known as the induced intrinsic metric, as follows: is the infimum of the lengths of all paths from to .

Here, a path from to is a continuous map

with and . The length of such a path is defined as explained for rectifiable curves. We set if there is no path of finite length from to . If

for all points and in , we say that is a length space or a path metric space and the metric is intrinsic.

We say that the metric has approximate midpoints if for any and any pair of points and in there exists in such that and are both smaller than

.

Examples

  • Euclidean space Rn with the ordinary Euclidean metric is a path metric space. Rn - {0} is as well.
  • The unit circle S1 with the metric inherited from the Euclidean metric of R2 (the chordal metric) is not a path metric space. The induced intrinsic metric on S1 measures distances as angles in radians, and the resulting length metric space is called the Riemannian circle. In two dimensions, the chordal metric on the sphere is not intrinsic, and the induced intrinsic metric is given by the great-circle distance.
  • Every Riemannian manifold can be turned into a path metric space by defining the distance of two points as the infimum of the lengths of continuously differentiable curves connecting the two points. (The Riemannian structure allows one to define the length of such curves.) Analogously, other manifolds in which a length is defined included Finsler manifolds and sub-Riemannian manifolds.
  • Any complete and convex metric space is a length metric space Template:Harv, a result of Karl Menger. The converse does not hold in general, however: there are length metric spaces which are not convex.

Properties

References

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