I want & symbol in small font size. But \small{\&}
produces italicized ampersand symbol like here. How can I get the small fontsize & symbol?
Edit: figured out that, the italics was because of the theorem environment (from acm_proc_article-sp style). Is there any way to override italics only for & character?
\DeclareMathOperator{\amp}{\textup{\scriptsize \&}}
solves the problem. As question is now closed, I can not add this as answer.