# Metric Tensor in R2

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1. Sep 15, 2015

### shanky

Hi,

Want to know (i) what does Riemannian metric tensor and Christoffel symbols on R2 mean? (ii) How does metric tensor and Christoffel symbols look like on R2? It would be great with an example as I am new to this Differential Geometry.

2. Sep 16, 2015

### Orodruin

Staff Emeritus
The metric tensor defines distances and inner products regardless of which space you are looking at. The Christoffel symbols tell you how your vector basis changes with the point in space. The exact expressions for the metric and Christoffel symbols depend on the chosen coordinate system.

3. Sep 16, 2015

### shanky

Thanks Orodruin.
But I want metric tensor(MT) and Christoffel symbols(CS) in R2 perspective? Consider any 3D object in space how does MT and CS look in R2?
What do you mean by choosing coordinate system ? Is it world / Cartesian coordinate system you mean?

4. Sep 16, 2015

### Orodruin

Staff Emeritus
It is unclear what you mean by "a 3D object in space ... Look in R2".

In order to express the components of the metric and the Christoffel symbols you need to select the coordinate system in which you want to find the components.

5. Sep 16, 2015

### shanky

3D object in Riemannian Space ..... real vector space with D=2 dimensions

6. Sep 16, 2015

### Orodruin

Staff Emeritus
Your use of the term "3D object" is confusing. What you are likely referring to is a two-dimensional manifold embedded in three dimensions.

A manifold in general is not a vector space - its tangent spaces are.

7. Sep 16, 2015

### shanky

Yah its manifold - tangent spaces. My main question was what does Riemannian metric tensor and Christoffel symbols on R2 mean? Illustrate with example

8. Sep 16, 2015

### Orodruin

Staff Emeritus
Your question is still not very clear.