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I'm using the mathabx package's circular arrows; however, since I otherwise prefer the usual amsmath symbols, I'm following the setup described in Importing a Single Symbol From a Different Font to import only the circular arrows.

Here is my code:


\DeclareFontShape{U}{mathb}{m}{n}{<5> <6> <7> <8> <9> <10> gen * mathb
<10.95> mathb10 <12> <14.4> <17.28> <20.74> <24.88> mathb12}{}

$A\mathbin{\raisebox{0.05ex}{\scalebox{0.9}{\rotatebox[origin=c]{270}{$\rcirclearrow$}}}} B$

$A\otimes B$

This is what is produced:

image description

As you can see, they are not lined up, even though I put the circular arrow inside \mathbin{}. Since I know that fiddling with \hspace and \raisebox is not fully "proper", and won't scale with changes to font or font size, my question is:

How can I make this circular arrow agree with other circular symbols like \oplus and \otimes, in a way that will scale properly? Is there a way to figure out the exact value needed to give to \scalebox to get the circular arrow to be the same size as an \otimes?

Incidentally, I suppose this raises the mathematical question of whether the circular arrow is to be considered a relation or an operator. In my context, I am using

 A (right-facing circular arrow) B

to mean "A acts on B". For example, we might have a group G acting on a space X.

Can any mathematically-inclined people give their opinions/reasoning for whether "acts on" is a relation or operation, and hence whether I should instead be giving the circular arrow a \mathrel or a \mathbin spacing?

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Welcome to TeX.sx! – Jubobs Mar 18 '13 at 4:16
up vote 4 down vote accepted

You loose horizontal space by scaling it at 0.9 of its original width. Besides that, I have defined the original \rcirclearrow as an \mathbin. The 0 you put there made it an Ord atom.

Putting the new symbol inside a box wide as the \rcirclearrow symbol you can achieve good results.




\DeclareFontShape{U}{mathb}{m}{n}{<5> <6> <7> <8> <9> <10> gen * mathb
<10.95> mathb10 <12> <14.4> <17.28> <20.74> <24.88> mathb12}{}

\leavevmode\llap{\smash{\rule[-2.3\baselineskip]{.4pt}{2.5\baselineskip}}}% only to show the alignment
$A \rcirclearrow B_{A \rcirclearrow B_{A \rcirclearrow B}}$%
\rlap{\smash{\rule[-2.3\baselineskip]{.4pt}{2.5\baselineskip}}}% again, only for alignment

$A \Rcirclearrow B_{A \Rcirclearrow B_{A \Rcirclearrow B}}$

$A \otimes B_{A \otimes B_{A \otimes B}}$


enter image description here

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