更改备注和定义环境的标题样式

Question

我想将“备注”和“定义”（不是“假设”）的标题（不是正文）改为“itshape”而不是“粗体”。你能帮我做吗？这里有一个实际示例

\documentclass[11 pt,a4paper, oneside, openany, notitlepage]{article}
\usepackage{amsmath, amssymb, graphics}
\usepackage{mathtools}
\newcommand{\mathsym}[1]{{}}
\newcommand{\unicode}[1]{{}}
\usepackage{amsthm}
\usepackage{amsfonts}
\usepackage[inner=15mm,outer=15mm,bottom=1.5cm]{geometry}
\usepackage{setspace}
\doublespacing

\newcommand{\thmsymbol}{\( \diamond \)}

 \newtheorem{remarkex}{Remark}
\newenvironment{remark}
  {\pushQED{\qed}\renewcommand{\qedsymbol}{$\triangle$}\remarkex}
  {\popQED\endremarkex}

 \newtheorem{definitionex}{Definition}
\newenvironment{definition}
  {\pushQED{\qed}\renewcommand{\qedsymbol}{$\star$}\definitionex}
  {\popQED\enddefinitionex}

\newtheorem{assumptionex}{Assumption}
\newenvironment{assumption}
  {\pushQED{\qed}\renewcommand{\qedsymbol}{$\bullet$}\assumptionex}
  {\popQED\endassumptionex}



\begin{document}

\begin{definition}{\normalfont (blah1)}
{\normalfont
blah2}
\end{definition}

\begin{remark}{\normalfont (blah1)}
{\normalfont
blah2}
\end{remark}

\begin{assumption}{\normalfont (blah1)}
{\normalfont
blah2}
\end{assumption}




\end{document} 

Answer 1

我强烈建议您深入研究amsthm文档。

这是一个基本的例子amsthm

\documentclass[11 pt,a4paper, oneside, openany, notitlepage]{article}
\usepackage{amsmath, amssymb, graphics}
\usepackage{mathtools}
\newcommand{\mathsym}[1]{{}}
\newcommand{\unicode}[1]{{}}
\usepackage{amsthm}
\usepackage{amsfonts}
\usepackage[inner=15mm,outer=15mm,bottom=1.5cm]{geometry}
\usepackage{setspace}
\doublespacing

\newcommand{\thmsymbol}{\( \diamond \)}

\newtheorem{assumptionex}{Assumption}
\newenvironment{assumption}
  {\pushQED{\qed}\renewcommand{\qedsymbol}{$\bullet$}\assumptionex}
  {\popQED\endassumptionex}

\newtheoremstyle{mythm}%
{3pt}% Space above
{3pt}% Space below
{}% Body font 
{}% Indent amount
{\bfseries}% ⟨Theorem head font⟩
{}% ⟨Punctuation after theorem head ⟩
{.5em}% Space after theorem head 
{}%

\theoremstyle{mythm}
 \newtheorem{remarkex}{Remark}
\newenvironment{remark}
  {\pushQED{\qed}\renewcommand{\qedsymbol}{$\triangle$}\remarkex}
  {\popQED\endremarkex}

 \newtheorem{definitionex}{Definition}
\newenvironment{definition}
  {\pushQED{\qed}\renewcommand{\qedsymbol}{$\star$}\definitionex}
  {\popQED\enddefinitionex}





\begin{document}

\begin{definition}[blah1]
{blah2}
\end{definition}

\begin{remark}[blah1]
{blah2}
\end{remark}

\begin{assumption}{ (blah1)}
{blah2}
\end{assumption}




\end{document} 

结果如下：

我所做的是定义一个新的定理样式，并\bfseries使用定理头字体。还请注意，这normalfont不是必需的。

Answer 2

下面是一个如何使用 来实现的示例ntheorem。请注意，改变定理结束符号非常容易，并且其位置是自动的，即使定理以显示的方程结束。

\documentclass[11 pt, a4paper, oneside, openany, notitlepage]{article}
\usepackage{amsfonts ,amssymb}
\usepackage{mathtools}
\usepackage[amsmath, thmmarks]{ntheorem}
\usepackage[inner=15mm,outer=15mm,bottom=1.5cm]{geometry}
\usepackage{setspace}
\doublespacing

\theoremstyle{plain}
\theoremheaderfont{\normalfont\itshape}
\theorembodyfont{\normalfont}
\theoremseparator{.}
\theoremsymbol{\ensuremath{\triangle}}
\newtheorem{remark}{Remark}
\theoremsymbol{\ensuremath{\star}}
\newtheorem{definition}{Definition}
\theoremsymbol{\ensuremath{\bullet}}
\theoremseparator{\upshape:}
\newtheorem{assumption}{Assumption}

\begin{document}

\begin{definition}
  blah2
\end{definition}

\begin{remark}
  blah2
\end{remark}

\begin{assumption}
  For all $ x, y, z ∈ \mathbf R$, one has
  \[ (x + y) + z= x +( y + z) \]
\end{assumption}

\end{document}