Mathematical Proof: Does Euclidian Geometry Hold in Riemannian?

In summary, Euclidean Geometry proofs are valid in Riemannian spaces with zero curvature, but may not be valid in Riemannian spaces with non-zero curvature. More specific examples would be needed to determine the validity of a particular proof.
  • #1
Patrick Sossoumihen
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Some of proofs without words have been described using Euclidian Geometry, do those proofs still hold alike in Riemmanian Geometry?
 
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  • #2
Patrick Sossoumihen said:
Some of proofs without words have been described using Euclidian Geometry, do those proofs still hold alike in Riemmanian Geometry?
Hi Patrick:

Riemannian space with zero curvature is the same as Euclidean space (at least for 2 and 3 dimensions). So in principle any Euclidean Geometry proof would also be valid in a Riemannian space with a zero curvature tensor. It would likely not be valid in a Riemannian space with non-zero curvature.

If you can post some examples of particular Euclidean Geometry proofs, I might be able to offer a more specific answer.

Hope this helps.

Regards,
Buzz
 

1. What is Euclidian geometry?

Euclidian geometry is a branch of mathematics that deals with the properties and relationships of points, lines, angles, and figures in space. It was developed by the Greek mathematician Euclid and is based on five postulates that are used to prove geometric theorems.

2. What is Riemannian geometry?

Riemannian geometry is a branch of mathematics that deals with the properties and relationships of geometric figures on curved surfaces. It was developed by the German mathematician Bernhard Riemann and is based on the concept of curvature, which allows for the study of non-Euclidian spaces.

3. How does Riemannian geometry differ from Euclidian geometry?

While Euclidian geometry is based on the concept of flat, or Euclidian, space, Riemannian geometry allows for the study of curved spaces. This means that the postulates and theorems in Euclidian geometry may not hold true in Riemannian geometry.

4. Can Euclidian geometry hold in Riemannian geometry?

Yes, some aspects of Euclidian geometry can hold in Riemannian geometry, but not all. For example, the first four postulates of Euclid are still valid in Riemannian geometry, but the fifth postulate, also known as the parallel postulate, does not hold true in all curved spaces.

5. How is the validity of Euclidian geometry in Riemannian geometry determined?

The validity of Euclidian geometry in Riemannian geometry is determined by the curvature of the space in question. In spaces with zero curvature, Euclidian geometry is valid. However, in spaces with non-zero curvature, Euclidian geometry may not hold true and Riemannian geometry must be used instead.

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