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The space in default output of `ExportString` to Latex 





ExportString[Subscript[\[Alpha], 1], "TeX"]

(*
    %% AMS-LaTeX Created by Wolfram Mathematica 9.0 : www.wolfram.com\documentclass{article}\u
sepackage{amsmath, amssymb, graphics, setspace}\newcommand{\mathsym}[1]{{}}\newcommand{\un
icode}[1]{{}}\newcounter{mathematicapage}\begin{document}\[\alpha _1\]\end{document}
*)


Of course, I can remove the space in via the option "BoxRules", and $\alpha _1$ can also rendered well in SE.


But many people would edit my $\alpha _1$ into $\alpha_1$, do you know whether there are any reasons for the default space generated by ExportString?


The same to other boxes.



Answer



The spaces in LaTeX export are harmless, but I think there is a valid reason to insert them after any control sequence such as \alpha: it is the easiest way to avoid creating undefined control sequences in situations where \alpha is followed by a variables name like b that is not itself a control sequence. Without spaces, this would be translated to \alphab which is obviously undefined.


This problem only arises at the end of control sequences, it's no problem when there are just a couple of variable names like a b. For them, it's permissible to leave out the space entirely and LaTeX will nevertheless treat each single letter as a separate variable. Therefore, ExportString[Subscript[a b, 1], "TeX"] doesn't insert any extra spaces after b. It only does it after symbols that translate to control sequences such as \alpha.


I'm by no means saying that Mathematica's space insertion trick is the prettiest way to export LaTeX, but it's an easy (or you might say lazy) solution.


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