Conformal mapping. From an ellipse to a rectangle

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Discussion Overview

The discussion revolves around the possibility of transforming an ellipse into a rectangle using conformal mapping techniques. Participants explore the theoretical aspects of such transformations, including the implications of conformality and the nature of the mappings involved.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant inquires about the possibility of transforming an ellipse defined by the equation x^2/a^2 + y^2/b^2 = 1 into a rectangle, seeking detailed explanations.
  • Another participant asserts that conformal mappings preserve angles, suggesting that such a transformation may not be possible.
  • A different participant mentions a known transformation from a rectangle to an ellipse, referencing a source but noting that it is not conformal at certain points.
  • Further discussion highlights that there are specific points on the boundary of an ellipse where conformal mapping to a rectangle cannot occur due to the absence of right angles.
  • One participant expresses awareness of the limitations of conformal mappings but asks if there exists a transformation aside from the identified points of failure.
  • Another participant questions whether the focus is on transforming the shapes themselves or their interiors.
  • A suggestion is made to map the ellipse to the real axis and then map the real axis to a regular polygon using Schwartz-Christoffel transformations.

Areas of Agreement / Disagreement

Participants generally disagree on the feasibility of transforming an ellipse into a rectangle using conformal mappings, with some asserting limitations and others exploring alternative transformation methods. The discussion remains unresolved regarding the existence of a valid transformation.

Contextual Notes

Participants note the importance of conformality in mappings and the specific geometric properties of ellipses and rectangles that may affect the transformation process. There are references to existing literature that may not fully address the inquiries raised.

traianus
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Is it possible to transform an ellipse

x^2/a^2 + y^2/b^2 = 1 ("a" minor or major semiaxis)

Into a rectangle?
If so, how can I do it? I am not very familiar so please explain all the details. I know the transformation from a circle to an airfoil, but not this one.
 
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Conformally? I don't think so. Conformal mappings preserve angles.
 
I know that there is a transformation from a rectangle to an ellipse (book advanced enginnering mathematics by Kreyszig) but it is not conformal somewhere
 
Like I just said, conformal mappings preserve angles. There are at least four places where a rect-angle ('rect' means 'right', 'angle' means 'angle') cannot be mapped conformally to an ellipse. Are there any right angles on the boundary of an ellipse?
 
AKG, what you are saying is obvious and I knew it. But, except these four points, is there a transformation?
 
Are you really looking to turn an ellipse into a rectangle, or are you more interested in their interiors?
 
I am trying to transform the ellipse into a rectangle
 
traianus said:
I know that there is a transformation from a rectangle to an ellipse (book advanced enginnering mathematics by Kreyszig) but it is not conformal somewhere

Hi, I found your quote while doing a search for transforming a rectangle to an ellipse. I found the book you mentioned and could not find the information I am looking for.

Can anyone assist me in finding out how to transform a rectangle into an ellipse?

Thanks
 
What you can do is map the ellipse to the real axis and map the real axis to a regular 4-sided polygon using Schwartz-Christoffel.
 

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