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 P: 399 why is the product undecided ?? using the "convolution theorem" i can get the product of 2 dirac delta functions $$D^{m}\delta (u) D^{n}\delta (u)$$ as the Fourier transform of the convolution of the 2 functions $$A(x^{m}*x^{n} )$$ so this convolution would define the product. jere A is a constant that can be a real or pure imaginary number