What is the product of two Dirac delta functions

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SUMMARY

The product of two Dirac delta functions, specifically δ(Real(z-c)) and δ(Img(z-c)), results in the complex-valued delta distribution δ(z-c). This conclusion is established by recognizing that the product of real-valued delta distributions yields a complex delta distribution. Verification can be performed through integration over the complex plane, confirming the relationship between the real and imaginary components of the complex variable.

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Homework Statement


What is the product of two Dirac delta functions

δ(Real(z-c))δ(Img(z-c))=?
'z' and 'c' are complex numbers.

This is not a problem, But I just need to use this formula in a derivation that I am currently doing. I just want the product of these two Dirac delta functions as a single/double Dirac delta function. I don't need the derivation, just the formula is enough.
 
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If your δ are real-valued delta distributions, that product is simply the complex-valued delta distribution, δ(z-c). You can verify this by integrating over the complex plane.
 
The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?

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