Circle Inversion Mapping: Proof of w = 1/z Transforming |z-1| = 1 to x = 1/2

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SUMMARY

The inversion mapping defined by w = f(z) = 1/z effectively transforms the circle defined by |z - 1| = 1 into the vertical line x = 1/2. The correct equation derived from the circle's definition is (a - 1)^2 + b^2 = 1, which simplifies to a^2 + b^2 = 2a. This correction is crucial for accurately demonstrating the mapping process. The transformation is straightforward once the correct relationships are established.

PREREQUISITES
  • Complex number representation (z = a + ib)
  • Understanding of circle equations in the complex plane
  • Knowledge of inversion mappings in complex analysis
  • Familiarity with basic algebraic manipulation
NEXT STEPS
  • Study the properties of complex inversion mappings
  • Explore the geometric interpretations of complex transformations
  • Learn about the implications of conformal mappings in complex analysis
  • Investigate the relationship between circles and lines in the complex plane
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Students of complex analysis, mathematicians interested in geometric transformations, and educators teaching advanced algebra concepts.

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Homework Statement


Show that the inversion mapping w = f(z) = 1/z maps the circle |z - 1| = 1 onto the vertical line x = 1/2.


Homework Equations





The Attempt at a Solution


z = a + ib
w = x + yi = a^2/(a^2 + b^2) + ib^2/(a^2 + b^2)
|z - 1| = |(a -1) + ib | = 1
(a - 1)^2 + b^2 = 1
a^2 + b^2 = 2ab

Not sure what to do afterwards.
 
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Hint: The last equation is wrong. It should read a^2+b^2=2a, which makes your job a whole lot easier.
 
Thanks! That was really easy.
 

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