Using Unicode characters in \newcommand is limited to one character.

[quantenzitrone]

Description

Using Unicode characters in \newcommand is limited to one character.

Add info or delete as appropriate:

• occurred with XeLaTeX in TexStudio
• Issue tracker has been searched for similar issues
• I may be just too much of a TeX beginner

Minimal example demonstrating the issue

\newcommand{\Σ}{\sum}
\newcommand{\Π}{\prod}
\newcommand{\∫}{\int} % i know ∫ is already \int

works, but

\newcommand{\∫∫}{\iint}
\newcommand{\∫∫∫}{\iiint}
\newcommand{\o∫}{\oint}
\newcommand{\∫o}{\oint}

doesn't work.

[davidcarlisle]

that is just standard tex syntax: you can have multiple characters of catcode 11 (letter) or a single characer. You can define \= but not \== It is not related to Unicode.

[quantenzitrone]

Oh, ok thanks.

[quantenzitrone]

This works:

\catcode`∫=11
\newcommand{\∫}{\int}
\newcommand{\∫∫}{\iint}
\newcommand{\∫∫∫}{\iiint}
\newcommand{\o∫}{\oint}

\begin{document}
    \catcode`∫=11
    $$ \∫_{i=1}^{5} x^2 $$
    $$ \o∫_{i=1}^{5} x^2 $$
    $$ \∫∫_{i=1}^{5} x^2 $$
    $$ \∫∫∫_{i=1}^{5} x^2 $$
\end{document}

thanks again!

[ArchangeGabriel]

Another option is to use a keyboard that has these symbols: ∑∫∮∬ for instance are available in the BÉPO keyboard on the “scientific deadkey” + all 4 standard combinations with the “s” key. ;)