I have a \tabbing environment within a \theorem environment.
How can I have the text within this single \tabbing upright instead of italic?
MWE:
\documentclass[a4paper,12pt,oneside]{article}
\usepackage{amsmath, amsthm, amssymb}
\newtheorem{theorem}{Theorem}
\begin{document}
\begin{theorem}
Some italic text.
\begin{tabbing}
Some non-italic =text\
where I >can use tabbing.
\end{tabbing}
\end{theorem}
\end{document}
The commands you are looking for are \upshape and \itshape. For more information, What is the origin of the family/series/shape distinction?
As I note in a comment about scope, if \upshape is in force before entering the tabbing environment, it will apply to all rows of the tabbing. If it is invoked within the tabbing environment, it will only apply to its particular scope, which for tabbing, is a single row.
\documentclass[a4paper,12pt,oneside]{article}
\usepackage{amsmath, amsthm, amssymb}
\newtheorem{theorem}{Theorem}
\begin{document}
\begin{theorem}
Some italic text.
\upshape\begin{tabbing}
Some non-italic =text\
where I >can use tabbing.
\end{tabbing}\itshape
More text.
\end{theorem}
\end{document}
\textstyleis a math mode primitive, so it's not clear at all what you want, since you can't really set text in\textstyle. Please edit your question and show us the code you are using and what the problem actually is. – campa Apr 29 '21 at 08:52\documentclass} that shows the problem. Welcome to the site. – Steven B. Segletes Apr 29 '21 at 09:07amsthmpackage is used with\theoremstyleto achieve upright or italic. However, if you speak of only changing part of the style within the theorem to upright, the declaration for upright shape is\upshapeand that for italic shape is\itshape. – Steven B. Segletes Apr 29 '21 at 09:13\upshapeat the start of each row then? – Xoriun Apr 29 '21 at 09:17\upshapeis in force before entering thetabbingenvironment, it will apply to all rows of thetabbing. If it is invoked within thetabbingenvironment, it will only apply to its particular scope, which fortabbing, is a single row. – Steven B. Segletes Apr 29 '21 at 09:21