Equation of a vertical line in the complex plane

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SUMMARY

The discussion centers on solving the integral \(\int_L \bar{z}-1\) where \(L\) represents a vertical line from \(1\) to \(1+2i\) in the complex plane. The user initially struggles to express the vertical line's equation, contrasting it with non-vertical lines, which can be represented as \(z=x+i(mx+b)\). A participant clarifies that the correct representation for the vertical line is \(z = 1 + iy\) for \(0 \leq y \leq 2\), resolving the user's confusion.

PREREQUISITES
  • Understanding of complex numbers and the complex plane
  • Knowledge of integration techniques in complex analysis
  • Familiarity with the concept of complex conjugates
  • Basic understanding of parametric equations
NEXT STEPS
  • Study the properties of complex conjugates in integration
  • Learn about parametric equations in the context of complex functions
  • Explore the concept of contour integration in complex analysis
  • Investigate the implications of vertical lines in the complex plane
USEFUL FOR

Students and educators in mathematics, particularly those focused on complex analysis, as well as anyone looking to deepen their understanding of integration in the complex plane.

zeebo17
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Homework Statement



I need to solve \int_L \bar{z}-1 where L is the line from 1 to 1+2i.


Homework Equations





The Attempt at a Solution



I know that I need to set z equal to the equation of the line and then integrate, but in this case I'm not sure how to express the equation of the vertical line in the complex plane.

In the case of the non-vertical line I would write z=x+i(mx+b) where m is the slope of the line and b is the y-intercept, however in this case the y is undefined.
 
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zeebo17 said:

Homework Statement



I need to solve \int_L \bar{z}-1 where L is the line from 1 to 1+2i.


Homework Equations





The Attempt at a Solution



I know that I need to set z equal to the equation of the line and then integrate, but in this case I'm not sure how to express the equation of the vertical line in the complex plane.

In the case of the non-vertical line I would write z=x+i(mx+b) where m is the slope of the line and b is the y-intercept, however in this case the y is undefined.

The y-values aren't undefined; they're arbitrary. Wouldn't your equation be z = 1 + iy, 0 <= y <= 2i?
 
Oh! Great, thanks!
 

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