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### Questions (4)

 12 What's more common? Re / Im or Fraktur-R / Fraktur-I for real / imaginary part? 2 Sum over cosines = dirac delta - how to get the coefficients? 2 What's the equivalent to floor(x) and ceil(x) for real numbers? 0 Partial derivative: Why does substitution order matter?

### Reputation (185)

 +60 What's more common? Re / Im or Fraktur-R / Fraktur-I for real / imaginary part? +10 Sum over cosines = dirac delta - how to get the coefficients? +10 What's the equivalent to floor(x) and ceil(x) for real numbers?

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### Tags (8)

 0 notation × 2 0 derivatives 0 problem-solving 0 distribution-theory 0 summation 0 fourier-analysis 0 complex-numbers 0 fourier-series

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