Solve 2D Green Function: Star Equation

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SUMMARY

The discussion centers on integrating the star equation related to the 2D Green Function, specifically addressing the integral \(\int d x_1 \int d x_2 \frac{d^2G}{d x_1}\). A participant highlights a misunderstanding regarding the evaluation of the integral, noting that the expression \(\int d x_2\) evaluated from \(-\epsilon\) to \(\epsilon\) results in zero, which is identified as an error. The correct interpretation leads to the conclusion that the answer should be \(2a\pi\), emphasizing the importance of correctly applying Green's function principles in the integration process.

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PeteSampras
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Hello, i don't understand how i integrate the star equation at the figure.

Fot example \int d x_1 \int d x_2 \frac{d^2G}{d x_1}

= \int d x_1 \frac{d^2G}{d x_1} \int d x_2

but <b><b>\int d x_2 </b></b>
x_2|^\epsilon_{-\epsilon}=0 ...sure this is a error, but i don't understand how i find the answer 2a\pi
 

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  1. I think you mean Green's function.
  2. The integral - such as you have presented it - makes little sense. \int_{a}^{b} dx_{1} = b - a. Also \frac{d^{2}G}{dx_{1}} makes no sense.
 

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