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 Apr 27 comment Sum over cosines = dirac delta - how to get the coefficients? I edited my question, I forget the boundaries, sorry. Apr 27 comment Sum over cosines = dirac delta - how to get the coefficients? @Did This is from a physical problem. There's the restriction $0 \leq x \leq d$. Nov 10 comment Maybe Things Can be Divided by Zero But I could start with f(x) = x that is defined everywhere and expand it by x/x to f(x) = x^2/x. This should not be defined at x = 0 suddenly? Isn't it so that a function is defined everyhwere when the numerator has a higher power than the denominator? Or the other way round: If I take the limit z -> 1 in the question, I think this would be allowed and leead to the result 2. Nov 10 comment What's more common? Re / Im or Fraktur-R / Fraktur-I for real / imaginary part? Because of Latex I'm actually here. I was wondering if there's a special reason why Latex defaults \Re and \Im to the Fraktur versions. Nov 10 comment What's more common? Re / Im or Fraktur-R / Fraktur-I for real / imaginary part? Thanks, corrected. Nov 2 comment Partial derivative: Why does substitution order matter? Thanks all of you. I chose this answer as the correct one in combination with Willies comment which solved my problem fully ("independent" was the keyword, I was not aware of this). Nov 2 comment Partial derivative: Why does substitution order matter? partial derivative of f(x, g(x), h(x)) by x treats g and h as constant, I thought? Or the other way round: Then why partial derive at all if I'm not allowed to treat something as constant? Nov 2 comment Partial derivative: Why does substitution order matter? But I thought the partial derivative does exactly this: take everything as constant but the variable that shows up directly itself.