Delta Function of Complex Number: How to Define

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Discussion Overview

The discussion centers on the definition and properties of the delta function when applied to complex numbers, specifically the expression \(\delta(x-a-ib)\), where \(a\) and \(b\) are real numbers. The scope includes theoretical considerations and mathematical reasoning related to the delta function in complex analysis.

Discussion Character

  • Technical explanation, Debate/contested, Mathematical reasoning

Main Points Raised

  • One participant questions how to define the delta function for a complex number, specifically \(\delta(x-a-ib)\).
  • Another participant asserts that the delta function is meaningful only under an integral sign and prompts for the integral in question.
  • A different participant suggests that the integral would be non-zero only for complex paths, implying a specific condition for the delta function's application.
  • In contrast, another participant claims that the delta function for complex numbers behaves similarly to that for real numbers, providing a definition involving an integral that evaluates to \(f(a+bi)\) if \(a+bi\) is within the integration bounds.

Areas of Agreement / Disagreement

Participants express differing views on the definition and properties of the delta function for complex arguments, with no consensus reached on the correct interpretation or application.

Contextual Notes

Participants have not fully resolved the implications of applying the delta function to complex numbers, and there are varying assumptions about the conditions under which the integral is evaluated.

zetafunction
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how to define this ??

[tex]\delta (x-a-ib)[/tex]

here a and b are reals so we are delaing with the delta function of a COMPLEX number

can it be ??
 
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The delta function is meaningful only under an integral sign. What is the integral?
 


yes of course, but according to this and from the properties of diract delta fnction only for COMPLEX PATH would be the integral non-zero wouldn't it ?
 


That sentence makes no sense.

The delta function of complex numbers is exactly the same as for real numbers: [itex]\delta(x- a- bi)[/itex] is the distribution such that [itex]\int_B f(x)\delta(x-a-bi)dx= f(a+bi)[/itex] if a+ bi is in the set B, 0 if not.
 

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