Branch Cut for (lnz)^2: Determining Branch Points and Range

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Homework Help Overview

The discussion revolves around the branch cut for the function (lnz)^2, specifically focusing on determining branch points and the range of the function. Participants explore the similarities to the branch cut for lnz and question the behavior of the function as z approaches certain values.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants inquire about the range of the function and whether z approaches 0 to ∞. There are questions regarding the proper methods to identify branch points of a function. Some express uncertainty about the clarity of the original question, suggesting a need for more precise phrasing.

Discussion Status

The discussion is ongoing, with some participants providing insights into the nature of branch cuts and the holomorphic properties of ln(z). There is a recognition of differing preferences for approaches, such as the use of Riemann surfaces. However, no consensus has been reached on the specific branch points or the range of the function.

Contextual Notes

Participants note the ambiguity in the original question, which may hinder responses. The discussion also reflects a general understanding that branch cuts can be chosen based on logical reasoning, though preferences vary among participants.

CrimsonFlash
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Homework Statement


It is simply the same as the one for lnz i.e. does it go from 0 to ∞?
Also, is there any proper way to figure out branch points of a function?

Homework Equations





The Attempt at a Solution

 
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CrimsonFlash said:

Homework Statement


It is simply the same as the one for lnz i.e. does it go from 0 to ∞?
Also, is there any proper way to figure out branch points of a function?
Do you mean, "Does z go from 0 to ∞?" Your question is unclear, which is why no one will answer.

Generally, branch cuts can be made fairly arbitrarily as long as they make sense. Though, I personally prefer to use Riemann surfaces because they are more fun for me.
 
Certainly if you have a domain where ln(z) is defined holomorphically, then ln(z)2 is also holomorphic on the same domain
 
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Ok thanks.
 

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