自定义定理环境中的粗体倾斜数字

Question

使用 amsthm 包，我为我的笔记定制了一个定理环境。定理标题是粗体和倾斜的。但我还希望数字倾斜。（它已经是粗体了，但它是直立的。）在代码中，标题应该是这样的：

\textbf{\textsl{Theorem 1}.}.

Answer 1

您必须覆盖头部规范。

\documentclass{article}
\usepackage{amsthm}

% see https://tex.stackexchange.com/a/17555/4427
\newtheoremstyle{boldslanted}
  {\topsep}   % ABOVESPACE
  {\topsep}   % BELOWSPACE
  {\itshape}  % BODYFONT
  {0pt}       % INDENT (empty value is the same as 0pt)
  {\bfseries\slshape} % HEADFONT
  {.}         % HEADPUNCT
  {5pt plus 1pt minus 1pt} % HEADSPACE
  {\thmname{#1}\ \thmnumber{#2}{\thmnote{\normalfont\ (#3)}}} % CUSTOM-HEAD-SPEC

\theoremstyle{boldslanted}
\newtheorem{theorem}{Theorem}

\begin{document}

\begin{theorem}
This is a difficult theorem.
\end{theorem}

\begin{theorem}[Easy]
This is an easy theorem.
\end{theorem}

\end{document}