3

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?

  • 3
    There's no universal symbol for the three entities; some use fraktur ℜ and ℑ for the real and imaginary part of a complex number (\Re and \Im are predefined for this). I've seen several symbols for the Fourier transform: pick one an be consistent across a paper. Better yet, do \newcommand{\FT}{\mathcal{F}}$ and use \FT: you'll be able to change all appearances by just modifying this definition. – egreg Sep 12 '14 at 15:15
  • What can I do about the size of the letter? – Adam Sep 12 '14 at 15:19
  • I'm not sure I understand. – egreg Sep 12 '14 at 15:27
  • 1
    In the books I have the impression that it is represented a lot bigger. – Adam Sep 12 '14 at 15:50
  • 1
    Isn't the real part of an imaginary number 0? ;-) – John Kormylo Sep 12 '14 at 19:43
5

Please choose what you like. If you are not able to use Lua- or XeLaTeX, let me know.

% arara: lualatex

\documentclass{article}
\usepackage{relsize}
\usepackage{unicode-math}
\usepackage{booktabs}
\newcommand*{\enlarge}[1]{\mathlarger{\mathlarger #1}}

\begin{document}  
    \begin{tabular}{llll}\toprule
        Font & Normal & Bold & Big\\\midrule
        Latin Modern Math & $\Re(i)\mscrR(i) \mscrF$&$\mbffrakR(i)\mbfscrR(i)\mbfscrF$&$\enlarge{\Re}(i)\enlarge{\mscrR}(i) \enlarge{\mscrF}$\\
        XITS Math & \setmathfont{XITS Math}$\Re(i)\mscrR(i) \mscrF$&$\mbffrakR(i)\mbfscrR(i)\mbfscrF$&$\enlarge{\Re}(i)\enlarge{\mscrR}(i) \enlarge{\mscrF}$\\
        Asana Math & \setmathfont{Asana Math}$\Re(i)\mscrR(i) \mscrF$&$\mbffrakR(i)\mbfscrR(i)\mbfscrF$&$\enlarge{\Re}(i)\enlarge{\mscrR}(i) \enlarge{\mscrF}$\\
        TeX G. P. Math & \setmathfont{TeX Gyre Pagella Math}$\Re(i)\mscrR(i) \mscrF$&$\mbffrakR(i)\mbfscrR(i)\mbfscrF$&$\enlarge{\Re}(i)\enlarge{\mscrR}(i) \enlarge{\mscrF}$\\\bottomrule
    \end{tabular} 
\end{document}

enter image description here

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.