Let $G$ be an (additive) abelian group. Is there a concise, standard term for the order of the kernel $K$ of the endomorphism $g\mapsto 2g$? Or alternatively, for the index of $K$?

Well I think for the good of all Math Overflowers, I should post the trick: Simply add the number of spaces you need to reach the limit followed by a punctuation mark. The extra spaces will not be displayed.
– Steven GubkinMar 15 '10 at 15:27

2

You can put in something like "Text$~~~~~~~~\$\{\}\$$" to avoid the space in front of the punctuation.
– Douglas ZareMar 15 '10 at 23:34