Tricky complex analysis questions....

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Discussion Overview

The discussion revolves around complex analysis, specifically focusing on the behavior of functions with poles and how to combine such functions. Participants explore the implications of combining functions with poles through addition, multiplication, and other operations, as well as identifying and classifying poles of a specific function.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant proposes creating rules for combining functions with poles and proving them.
  • Another participant questions the implications for the pole c when considering the sum of functions f and g.
  • A third participant reiterates the question about the behavior of c when functions are combined, suggesting it pertains to various operations like addition, multiplication, and subtraction.
  • A later reply suggests using the Laurent expansion of the functions around the pole c to analyze the effects of arithmetic operations on the series.

Areas of Agreement / Disagreement

Participants express varying interpretations of how to approach the combination of functions with poles, indicating that multiple competing views remain without a consensus on the rules or methods to apply.

Contextual Notes

Limitations include potential missing assumptions about the nature of the functions f and g, as well as the specific conditions under which the poles are classified.

Zukias
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i.
Let f and g be functions with a pole at c. Create rules (and prove them) about how we can combine f and g at c.

and ii: Find the poles of the function :
\frac{cotz+cosz}{sin2z}

and classify these poles using part i.
 
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Do you mean what happens to c when considering f+g ?
 
ZaidAlyafey said:
Do you mean what happens to c when considering f+g ?

I think it means when functions are multiplied, added, substracted, divided etc, that's what I'm assuming anyway
 
I'll say write the Laurent expansion of f and g around the pole c and see what happens when you apply the arithmetic operations on the series.
 

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