# Representing real part of a complex number and Fourier Transform symbol

I want to write in math mode the real part of a complex number and I used the command \mathcal{R}(i). The problem is that the R it produces is not the same as the R in most books that represent the real part. One reason is that it is small and it shouldn't be as it is not meant as a letter but as a symbol. Using the \mathcal{F} I had the same problem representing the Fourier Transform. What command do you use and you think is best and most beuatiful for there operations?

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