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Dirac Delta function is not 1 at x = xi, it's infinity. However its integral (over the entire domain) is 1, so the rest is OK.
At 15:10 we don't know for sure that 'f' doesn't contain 'c' terms. How can we cancel it ?!
it wouldn't contain cj terms, plus it's a partial derivative.
Dirac Delta function is not 1 at x = xi, it's infinity. However its integral (over the entire domain) is 1, so the rest is OK.
At 15:10 we don't know for sure that 'f' doesn't contain 'c' terms. How can we cancel it ?!
it wouldn't contain cj terms, plus it's a partial derivative.