fontstheorems
I have a constant defined by
\newcommand{\Lip}{\textrm{Lip}}
or
\def\Lip{\text{Lip}}
I use this constant in equations. But in the theorem environment, it appears in italic style. Does anyone know how to make it appear the same as it being put outside of theorem environment?
Thank you very much!
You have a \topsep of roughly 2.5pt plus 2.5pt, that is hardly noticed. With some like \setlength{\topsep}{5em} before of the new theorem style definition, you will see a big space before and after the theorem.
But instead of change a length that could be used elsewhere, it could be better use a new length for this, or just some like:
\newtheoremstyle{slanted}
{1em plus .2em minus .1em}% Space above
{1em plus .2em minus .1em}% Space below
....
The result you're seeing is just the italic Computer Modern font. It sounds like you would prefer if numbers were slanted rather than italic.
To do that, you could use \textsl to use a slanted font for numbers only. Then, the result looks like this.
\documentclass[a4paper,12pt]{article}
\usepackage{amsmath,amsthm,amssymb,mathrsfs,lineno}
\newtheorem{theorem}{Theorem}[section]
\begin{document}
\begin{theorem}
Any simple \textsl{1}-planar graph with minimum degree \textsl{7} has at least \textsl{24} vertices of degree \textsl{7}.
\end{theorem}
\end{document}
Another possibility is to change the whole plain theorem style (or to define a new one) so that the body of the theorem is all slanted. The result looks like this.
\documentclass[a4paper,12pt]{article}
\usepackage{amsmath,amsthm,amssymb,mathrsfs,lineno}
\newtheoremstyle{plain}
{\topsep} % ABOVESPACE
{\topsep} % BELOWSPACE
{\slshape} % BODYFONT
{0pt} % INDENT (empty value is the same as 0pt)
{\bfseries} % HEADFONT
{.} % HEADPUNCT
{5pt plus 1pt minus 1pt} % HEADSPACE
{} % CUSTOM-HEAD-SPEC
\newtheorem{theorem}{Theorem}[section]
\begin{document}
\begin{theorem}
Any simple 1-planar graph with minimum degree 7 has at least 24 vertices of degree 7.
\end{theorem}
\end{document}
Best Answer
if you are using
amsmath(which you may be, since you are using\text) it would be better to use\DeclareMathOperator{\Lip}{Lip}. then it will always be in an upright font.