Homemorphism between the set of circles with rational points and rectangles

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SUMMARY

The discussion focuses on proving that the set of circles with rational points and radii is homeomorphic to the set of rectangles with vertices at rational points, where the lengths of the diagonals are also rational numbers. The key approach involves defining a topology for both sets and demonstrating that each circle can be continuously deformed into a triangle, and vice versa. The participants suggest embedding circles within triangles as a method to establish this homeomorphism.

PREREQUISITES
  • Understanding of topology and homeomorphism concepts
  • Familiarity with rational numbers and their properties
  • Knowledge of geometric shapes, specifically circles and triangles
  • Basic principles of continuous deformation in mathematics
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  • Research the concept of homeomorphism in topology
  • Study the properties of rational points in geometric contexts
  • Learn about continuous deformation and its applications in topology
  • Explore embedding techniques in geometric topology
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Mathematicians, topology students, and researchers interested in geometric properties and homeomorphism proofs.

praveen97uma
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I am trying to solve a problem in which we need to prove that the set of all circles with rational points and radii is homemorphic to the set of all rectangles with vertices at rational points with the length of the diagonals as rational number. I am not able to figure out what the approach should be. Any help or hints to solve the problem would be deeply appreciated.
 
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Well, if you want to show a homeomorphism, youu need to have a topology defined
on each of the two sets.
 
I guess you mean each circle and each triangle is a subspace of the plane. Then I guess
we could just show that each circle can be continuously deformed to a triangle, and viceversa. Maybe we can embed each circle in a triangle.
 

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